Final answer:
The app receives maintenance such as fixing errors or monitoring performance during the Support and Security phase of the SDLC.
Step-by-step explanation:
During the Support and Security phase of the Software Development Life Cycle (SDLC), an app receives necessary maintenance, such as fixing errors or monitoring performance. This phase encompasses all activities related to maintaining and enhancing the software after it has been deployed to the end users. Activities can include debugging, updating software to adapt to new hardware, improving performance, or making the app more secure by patching vulnerabilities. The correct answer to the student's question is B. Support and security phase.