You have been reassigned to manage a project after the original PM suddenly quit. As you begin to familiarize yourself with the project, you notice that some of the functionality implemented was not part of the original project scope, and you don't understand which requirements these activities relate to$.$ How could the original project manager have avoided this situation?

A The original PM should have done a better job of documenting requirements in more detail.

B The original PM should have developed a change control process.

C The original PM should have created a more detailed WBS$.$

D The original PM should have created a requirements traceability$$matrix$.$