How Does Setting the "IP Video" Parameter to "N" (NO)

How does setting the "IP Video" parameter to "N" (NO) on the signaling group between Communication Manager and Session Manager affect Avaya IX™ Workplace Clients (Windows/Mac/iOS/Android) ?

A) The Clients can't use video during any type of calls.
B) The Clients can use video when calling each other, but can't use video when calling CM (H.323) users.
C) The Clients can use video during P2P calls, but can't use video during multipoint calls (calls to an Avaya Equinox Virtual Meeting Room) .
D) The Clients can use video during multipoint calls (calls to an Avaya Equinox Virtual Meeting Room) , but can't use video during P2P calls.