Which duration type should be used?

In your project, cost and work effort is not subject to change. Which duration type should be used?

A.
Fixed Units

B.
Fixed Duration and Units/Time

C.
Fixed Units/Time

D.
Fixed Duration & Units

Explanation:
Fixed Units/Time – Used when resource availability is a limiting factor, that is, the
activity has fixed resources with fixed productivity output per time period. When the activity
duration or units are changed, resource units per time remain constant. This duration type is
typically used for resource dependent activities.
Note: Duration TypeDuration type determines how remaining duration, units, and units/time will be
calculated when you update an activity that has resources assigned. The activity’s duration type
should correspond to the factor that is least flexible in the project: schedule, costs/work effort, or
resource availability.