What could be the reason?

You have created an internally-processed network activity, and assigned a work center and the work. After saving, you discover that no planned costs are displayed in the cost element report for the activity.

What could be the reason? Note: There are 3 correct answers to this question
A . The formula for costing in the work center is incorrect
B. The activity output price for the activity type and cost center assigned to the work center is not maintained.
C. The duration is missing in the activity
D. The Determine Costs indicator in the network header rules out planned cost calculation
E. Integrated planning for the network is active

Answer: A,B,D