Which of the following statements regarding a shared ephone-dn is valid? (Choose all that apply.)

A.
All ephones sharing the ephone-dn will ring for an incoming call.

B.
Multiple ephones can simultaneously listen to a call on the ephone-dn.

C.
The ephone-dn is inaccessible from other IP phones when there is an active call.

D.
The ephone-dn is exclusively shared among the same ephone type.