Identifying a Plan's Critical Path Allows the Project Manager to Monitor

Multiple Choice

Identifying a plan's critical path allows the Project Manager to monitor the activities that:
1) Must be completed on time if the whole plan is to be finished on schedule
2) Can be omitted if time tolerances are exceeded
3) Are not allowed any time tolerance
4) Can be delayed for a while if resources become tight

A) 1, 2
B) 2, 3
C) 1, 4
D) 3, 4