Which of the following is NOT true?

 Explanation of Critical Path:

A network can have multiple critical paths if multiple sequences of activities have zero float.

While it is common to have one critical path, having more than one is possible in complex projects.

 Evaluation of Other Options:

A: Remaining durations exceeding original durations can occur in updated schedules due to delays.

B: Constraints (e.g., finish-to-start, time constraints) can alter longest path calculations.

C: Multiple calendars influence total float when activities use different working days.

 Verification with PSP Guidelines:

The PSP Study Guide mentions the possibility of multiple critical paths in large or complex schedules (Ref: PSP Study Guide, Chapter 2A: Critical Path Analysis).