Which two statements are true about workitems? (Choose two.)

Which two statements are true about workitems? (Choose two.)
A . All approval workitems must be ASYNCHR in execution mode.
B . The number of workitems that need to be completed can be configured in the workflow.
C . The default action of the ManageWorkitem activity is to CLOSE a workitem.
D . Another workitem must be created for users who have already had a workitem in a particular event.

Answer: A,B