The term 'slack' indicates $($select all that apply$)$:

a synonym for 'float'.

the difference between the earliest finish and the latest finish times of an activity.

the difference between the earliest possible and latest permissible times of an activity.

the amount of leeway available for achieving an event without jeopardizing the completion time of the project.

wastage of resources.

surplus manpower available at any point in the project.

a flaw in the practice of project management.