What could be the reason for multiple commitment of invidula capacities, where several operations have the same scheduled dates on a work center (or resource) after planing?

What could be the reason for multiple commitment of invidula capacities, where several operations have the same scheduled dates on a work center (or resource) after planing?
A . The work center has several invidula capacities.
B. The finite Scheduling indicator is NOT set in the strategy profile.
C. The Change Planning Direction indicator is set in strategy profile.
D. Alternative work centers are fully occupied.

Answer: A,B