'SQLcl (including Liquibase)' (D) is the tool provided to support CI/CD workflows. SQLcl integrates with Liquibase to track, version, and deploy database schema changes, aligning with CI/CD pipelines. 'ADB console' (A) is for monitoring, 'Database Actions' (B) is for SQL tasks, and 'SQL Developer' (C) is a GUI tool, none of which are CI/CD-focused. Oracle's documentation highlights SQLcl's Liquibase integration for DevOps workflows.

'Oracle Exadata Cloud Service' (B) offers expanded flexibility with shared or dedicated Exadata infrastructure, allowing customers to choose between cost-effective shared resources or isolated dedicated hardware for performance and compliance needs. 'Oracle Database Cloud Service' (A) is VM-based and lacks Exadata's hardware integration, 'Oracle Autonomous Database' (C) is fully managed without hardware choice, and 'Oracle Exalogic Cloud Service' (D) is an outdated middleware platform, not database-focused. Oracle's documentation highlights Exadata Cloud Service's deployment options.

From the OCI Console for an 'Oracle Autonomous Database,' you can 'Scale up/down CPU' (A) to adjust compute resources dynamically and 'Increase Storage allocated for Database' (D) to expand capacity, both with no downtime. 'Increase Network Bandwidth' (B) is not a console-adjustable parameter (managed by Oracle), and 'Scale up/down Memory' (C) is not independently configurable (tied to CPU scaling). Oracle's documentation confirms CPU and storage scaling as user-controlled actions.

For migrating 'old database backups' to OCI, 'Archive Storage' (D) is the most cost-effective service. Archive Storage offers the lowest cost per gigabyte for long-term, infrequently accessed data, ideal for backups that don't require immediate retrieval. 'Object Storage (standard)' (A) is more expensive and suited for frequent access, 'Block Volume' (B) is high-performance and costly, and 'File Storage' (C) is for active file systems. Oracle's storage pricing and use case documentation recommend Archive Storage for cost-effective backup archival.

Full Detailed In-Depth Explanation: Oracle APEX (Application Express) is a leading low-code platform designed to simplify and accelerate application development, particularly within the Oracle ecosystem. The two main features of APEX's low-code platform are 'Use graphical user interfaces and configuration' (D) and 'Focus on business requirements' (F). Option D reflects APEX's core strength: it provides a browser-based, declarative development environment with drag-and-drop functionality, wizards, and visual UI tools, allowing developers and business users to build applications with minimal coding. This reduces complexity and speeds up development, aligning with the low-code philosophy. Option F highlights APEX's emphasis on enabling users to address business needs directly, rather than getting bogged down in technical intricacies, by offering prebuilt components and templates tailored to solve real-world problems efficiently. 'Limited productivity' (A) is incorrect, as APEX enhances productivity significantly. 'Build scalable web apps for MongoDB' (B) is false, as APEX is optimized for Oracle Database, not MongoDB. 'Simplified core-based licensing' (C) is a licensing aspect, not a development feature, and 'Use traditional computer programming paradigms' (E) contradicts APEX's low-code approach, which minimizes hand-coding. Oracle's official APEX documentation emphasizes its graphical, business-focused design as key differentiators.