Three advantages of using ccLog over the Salesforce standard System.debug class are:

There is no need to use string concatenation to easily tag log statements with a subject. ccLog allows passing a subject parameter to the log method, which will prepend the subject to the log message. For example,ccLog.log('This is a message', 'Subject')will log[Subject] This is a message.

There is no need to create a User Trace Flag. ccLog can be enabled by setting the value of CO.logToken to true in CCAdmin, which will activate logging for all users who access the storefront.

There is no need to manually set a cookie to debug with the Site Guest User. ccLog can be enabled for the Site Guest User by appending #ccLog=<Logging Token Name> to the end of the storefront URL in order to get logs in the inspector console. For example,https://my-storefront.com/#ccLog=debugwill enable logging for the Site Guest User with the debug level. Salesforce Reference:B2B Commerce and D2C Commerce Developer Guide,Logging

:To implement a custom child checkout component for a B2B or B2C store created with an LWR template, the developer must implement the CheckoutStep interface from thecommerce/checkoutmodule. This interface defines the methods and properties that the child component must have to communicate with the parent checkout component and the checkout data provider. The CheckoutStep interface extends the UseCheckoutComponent interface, which provides the common functionality for all checkout components, such as loading and saving data, reporting validity, and handling errors.

The other options are not correct because:

A) CheckoutSavable is not a valid interface for a custom child checkout component. There is no such interface in thecommerce/checkoutmodule or the Lightning web component framework.

B) Checkoutoutinterface is not a valid interface for a custom child checkout component. There is no such interface in thecommerce/checkoutmodule or the Lightning web component framework.

C) CustomCheckout is not a valid interface for a custom child checkout component. There is no such interface in thecommerce/checkoutmodule or the Lightning web component framework.

Create a Custom Checkout Component for a B2B or B2C Store (LWR)

CheckoutStep Interface

UseCheckoutComponent Interface

Three ways to implement custom post Order processing are:

Extend cc_hk_invoice to handle custom business logic post Order processing. This hook allows modifying the invoice data or performing additional actions after an Order is placed. For example, the hook can send an email notification or update a custom field on the invoice record.

Use cc_hk_Order.placeTarget to define a new Order Confirmation page which executes additional business logic. This hook allows specifying a custom Visualforce page that will be displayed after an Order is placed. The custom page can include additional business logic or user interface elements.

Use Process Builder to implement business processes that execute when an Order record is created. Process Builder is a tool that allows creating workflows and actions based on criteria and conditions. For example, Process Builder can create a task, send an email, or update a record when an Order record is created. Salesforce Reference:B2B Commerce and D2C Commerce Developer Guide,Hooks, Process Builder

To retrieve metadata about a specific object in a Lightning Web Component, a developer can use the getObjectInfo wire adapter. This adapter provides access to the metadata of a specified Salesforce object, including fields, record types, and layouts, which is essential for dynamic component rendering based on the object's schema.

Two technologies that can subscribe to the CommerceDiagnosticEvents event are Aura Components and Lightning web components. CommerceDiagnosticEvents is an event that is fired by Salesforce B2B Commerce when an error occurs in the storefront. CommerceDiagnosticEvents contains information about the error, such as error code, error message, error type, and error details. CommerceDiagnosticEvents can be subscribed by other components or services that want to handle or display the error information in different ways. Aura Components are a type of component that can be used to create custom user interfaces for Salesforce apps. Aura Components can subscribe to CommerceDiagnosticEvents using anaura:handlertag in their markup file. Theaura:handlertag specifies an event name, an action attribute that defines a controller function to handle the event, and other optional attributes. Lightning web components are another type of component that can be used to create custom user interfaces for Salesforce apps. Lightning web components can subscribe to CommerceDiagnosticEvents using an @wire decorator in their JavaScript file. The @wire decorator specifies an event name, a function name that defines a handler for the event, and other optional parameters. Processes are not a technology that can subscribe to CommerceDiagnosticEvents, as they are not related to user interface development or event handling. Processes are automated workflows that execute actions based on certain criteria or conditions in Salesforce. Streaming API is not a technology that can subscribe to CommerceDiagnosticEvents either, as it is not related to user interface development or event handling. Streaming API is an API that allows applications to receive notifications of data changes in Salesforce in near real-time. Salesforce Reference: [B2B Commerce Developer Guide: Handle Errors], [Aura Components Developer Guide: Handle Component Events], [Lightning Web Components Developer Guide: Communicate with Events], [Salesforce Help: Process Automation], [Salesforce Developer Guide: Streaming API]