Correct option is D
Slack refers to the amount of time by which a task or activity can be delayed without delaying the overall project completion time. It is calculated as:
Slack (S) = Latest Start Time (LST) − Earliest Start Time (EST)
·
Positive slack: Indicates extra time available for a task.
·
Zero slack: Indicates that the task lies on the
critical path and must start on time to avoid project delays.
·
Negative slack: Occurs when there is a
deficiency of resources or when the available time for completing an activity is less than the required time. This can happen due to scheduling conflicts or delays in prior activities.
