The implementation phase of the SDLC is when the new system or software is placed into production so that users can begin performing real business operations. This phase includes tasks such as installing the system, migrating data, training users, and transitioning from the old system to the new system.
Option A (Constructed using programming): This is part of the development phase, not implementation.
Option B (Corrections, additions, and upgrades): This describes the maintenance phase.
Option D (Interoperability checked, functionality verified): This occurs in the testing phase.
Therefore, the implementation phase specifically involves deploying the system into production for end users.
Reference:
WGU Information Technology Management - Systems Development Life Cycle, section on Implementation Phase.