A project manager wants to introduce the practice of a WBS to the PMO, but the other managers believe this will create extra work. Which of the following would BEST communicate the need for a WBS to the other managers? (Choose two.)

A. Using the WBS will help prevent work from slipping or being forgotten.
B. TheWBS will be required on very large projects.
C. TheWBS will be required if the project manager has the time available to complete it.
D. TheWBS will aid in determining which resources are required for the project.
E. The WBS is the best way to determine risks of the project.