PERT considers the following time estimates

Question

Consider the following statements:

PERT considers the following time estimates                                      

1. Optimistic time

2. Pessimistic time

3. Most likely time

Which of the statements given above are correct?

(a) 1, 2 and 3                  (b) 1 and 2 only

(c) 3 only                        (d) 1 and 3 only