In which of the following SDLC phases is the system's security features configured and enabled, the system is tested and installed or fielded, and the system is authorized for processing?

The Development/Acquisition Phase focuses on designing, coding, and acquiring the system, not typically the final configuration, testing, and authorization for processing.

The Operation/Maintenance Phase focuses on the day-to-day operation, monitoring, and ongoing maintenance of the system after it has been deployed, not the initial configuration, testing, and installation.

The Implementation Phase of the System Development Life Cycle (SDLC) is specifically where the system is built, integrated, tested, and installed in its operational environment. During this phase, security features are configured and enabled, the system undergoes comprehensive security testing (e.g., vulnerability scanning, penetration testing), and finally, it is installed or "fielded" and authorized for processing, signifying its readiness for operational use.

The Initiation Phase involves defining the need for a system, conducting feasibility studies, and establishing initial security requirements, but does not involve the physical configuration, testing, or installation.