Final answer:
Slack represents the amount of time by which an activity can be delayed without delaying the entire project. Immediate predecessor activities start at their earliest start times. option c.
Step-by-step explanation:
Slack represents the amount of time by which an activity can be delayed without delaying the entire project. In this question, the subject is project management, specifically related to scheduling and critical path analysis.
The correct answer to this question is option c. Immediate predecessor activities start at their earliest start times. This means that slack is calculated by subtracting the earliest start time of an activity from the latest start time of its immediate successor activity. If the slack value for an activity is positive, it means that the activity can be delayed without delaying the entire project.
For example, let's say Activity A has an earliest start time of day 2 and Activity B has a latest start time of day 6. The slack for Activity A would be calculated as 6 - 2 = 4, indicating that it can be delayed for 4 days without delaying the project.