Project schedule management includes the process required to manage the timely completion of the project. Adrian is working on the project as a project manager. Schedule management defines when the project will deliver the product. One of the options given below is not a valid process in project schedule management, which one is it?

A. Plan schedule management, develop schedule, control schedule.

B. Define activities, sequence activities.

C. Plan activities, Define scope, create WBS.

D. Estimate activity durations.