What condition would cause this behavior?

A vSphere administrator attempts to move a powered on virtual machine into a resource pool that is
configured in an HA/DRS cluster. The operation fails.
What condition would cause this behavior?

A.
HA admission control prevented the movement of the virtual machine due to insufficient
resources.

B.
Resource pool admission control prevented the movement of the virtual machine due to
insufficient resources.

C.
The virtual machine was not powered off before being moved into the resource pool.

D.
The virtual machine’s hardware level did not match the level of the existing virtual machines in
the resource pool.