Conceptual Question $19-8$ Which of the following statements is correct...

Which of the following statements is correct with respect to slack time?

The slack time of an activity is the latest completion time of the activity minus the earliest completion time.

The slack time of an activity is the latest start time of the activity minus the earliest start time.

The slack time of an activity determines how long an activity can be delayed without impacting the overall completion of the project.

All of these statements are correct.