In project schedule management, the main goal of which process is to ensure that the project team has a complete understanding of all the work they must do as part of the project scope so they can start scheduling the work? Select one: O a. estimating activity durations O b. controlling the schedule c. estimating activity resources O d. defining activities Which action involves reviewing the project charter, requirements documents, and organizational process assets to create a scope statement, adding more information as requirements are developed and change requests are approved? Select one: O a. Creating scope O b. Controlling scope O . Validating scope O d. Defining scope What statement is true regarding a return on investment or ROI? Select one: O a. The lower it is, the better. O b. It is the result of adding the project costs to the profits. c.It is always a positive number. O d. It is always a percentage.