What are two possible causes?

A vSphere Administrator attempts to remove a host from a vSphere distributed switch, and fails. There is a notification that resources are still in use.

What are two possible causes? (Choose two.)
A . There are virtual machine network adapters connected to the distributed switch.
B . There are VMkernel adapters on the distributed switch that are in use.
C . The administrator does not have sufficient rights to remove the host from the distributed switch.
D . The ESXi host has a virtual machine with over 256 GB RAM assigned.

Answer: A,B