An ISL between a Brocade VDX 8770-8 and a Brocade VDX 6720-24 is not coming up.
Which two conditions would cause this to happen? (Choose two)

A.
There is RBridge ID overlap between the switches.

B.
There is VCS ID overlap between the switches.

C.
VCS mode is disabled on the VDX 6720-24.

D.
VCS mode is disabled on the VDX 8770-8.