Rolling wave planning in the create WBS process refers to situations in which______________


A. Certain deliverables or subprojects will be accomplished far into the future
B. Additional work is added to the project after the scope baseline has been established; therefore, additional decomposition is required
C. Identification codes for the WBS elements cannot be determined until the schedule activity list is complete in case revisions are required
D. Subprojects are developed by external organizations and then become part of the WBS for the entire project