Final answer:
The last phase of the Security Systems Development Life Cycle (SecSDLC) is generally maintenance, which entails continuous support and updates for the system.
Step-by-step explanation:
The Security Systems Development Life Cycle (SecSDLC) is a framework used to develop secure information systems. The last phase of the SecSDLC is not specifically mentioned in the provided information, but generally, the last phase in any SDLC, including the SecSDLC, is maintenance. This phase is crucial for ensuring that the system continues to function correctly, remains secure against new threats, and is updated according to changing requirements. It comes after the system has been planned, designed, and implemented. Therefore, according to the general SDLC, the correct answer to the student's question would be 4) Maintenance. However, if the question is about the design process specifically and not SecSDLC, then the last step could vary, but typically it involves evaluation and refinement based on feedback and results.