A project manager gets a call from a team member notifying the project manager that there is a variance between the speed of a system on the project and the desired or planned speed. The project manager is surprised because that performance measurement was not identified in planning. If the project manager then evaluates whether the variance warrants a response, the project manager is in what project management process?
A、Initiating
B、Executing
C、Monitoring and controlling
D、Closing