Which two of these describe Meet-Me conferencing? (Choose two)

A.
The conference originator of the conference acts as the controller of the conference and is the
only participant who can add or remove other participants.

B.
Any participant can add and remove other conference participants.

C.
Anyone who has calling privileges to call the directory number while the conference is active
can join the conference.

D.
Multiple ad hoc conference can be added.

E.
A range of directory numbers must be allocated for exclusive use by the conference.