Which of the following statement(s) is/are true? A. The critical path is the path

Which of the following statement(s) is/are true?
A. The critical path is the path with the most activities.
B. The critical path is the path with the longest duration.
C. The critical path is the path with the greatest variability.
D. There can only be one critical path.
E. In CPM, another path could become critical.
F. In PERT, another path could become critical.
G. None of the above.