What is Activity Working Time?

Question $8$Select one:

A$.$

Derived from data, it$$s the average time the resource is allocated on the activity to complete it$.$

B$.$

Input from the user, it$$s the average elapsed time to complete the activity.

C$.$

Input from the user, it$$s the average time the resource is allocated on the activity to complete it$.$

D$.$

Derived from data, it$$s the average elapsed time to complete the activity.