A customer wants to allow users to create ad hoc conferences by dialing the Cisco
TelePresence MCU service prefix of 8, followed by a number for the conference. Which
global conference settings allow the customer to do this?

A.
Media port reservation: Enabled | Incoming calls to unknown conferences or auto
attendants: Default auto attendant | Register ad hoc conferences with gatekeeper: Off

B.
Media port reservation: Enabled | Incoming calls to unknown conferences or auto
attendants: Create new ad hoc conference | Register ad hoc conferences with gatekeeper:
Off

C.
Media port reservation: Disabled | Incoming calls to unknown conferences or auto
attendants: Default auto attendant | Register ad hoc conferences with gatekeeper: On

D.
Media port reservation: Disabled | Incoming calls to unknown conferences or auto
attendants: Create new ad hoc conference | Register ad hoc conferences with gatekeeper:
On