Free Slack tells us $...$

Question $9$ options:

A$)$

The difference between the forward pass and the backward pass.

B$)$

The amount of time an activity can be delayed without delaying any immediately following $($successor$)$ activity.

C$)$

The aount of time an activity can be delayed and not delay the project.

D$)$

The difference between the early start and the late finish