If a project has exactly one critical path, which one of the following statements is TRUE?

1. Crashing an activity on the critical path will always result in an increase in total project profits.
2. Crashing activities on the critical path will always result in having multiple critical paths for the project.
3. Crashing an activity on the critical path will always result in a reduced total project completion time.
4. The best schedule is one in which all activities are crashed as much as possible.
5. All of the above
6. None of the above