Resource leveling _____.

A.
Attempts to reduce resource requirements within a constraint on project duration

B.
Smoothes out resource requirements by rescheduling activities within their float time.

C.
Allocates resources to activities to find shortest schedule within fixed resource limits.

D.
Smooths out resource requirements by substituting activities with unassigned resources.

E.
1) Smoothes out resource requirements by rescheduling activities within their float time, or 2) Attempts to reduce resource requirements within a constraint on project duration