What is an MBSSID?

A.
a virtual AP configured on a physical AP that share a single physical device, which is one halfduplex radio

B.
a set of physical APs configured in a BSA to form cells that are controlled by a single controller

C.
the group of clients that are allowed to gain access to one or more SSIDs configured in an AP

D.
the identified overlap area between two cells, which identifies the clients that are operating in
that area at any given time