An Assumption of Three-Activity-Time CPM Analysis Is That the Activity

An assumption of three-activity-time CPM analysis is that the activity time estimates conform to the beta distribution.Which of the following is a valid criticism of this assumption?

A) Project activities cannot always be networked
B) Project control doesn't focus enough on the critical path
C) Obtaining three valid time estimates to put into the formula is difficult
D) Beta distributions do not occur naturally
E) None of the above

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