Which two of these support an ad-hoc conference call? (Choose two.)

A.
using the tab Administrative Tools > Configuration > Conference Settings in the Cisco
TelePresence Management Suite

B.
pressing the conference button on a Cisco Unified IP Phone 8941 to conference in a third
call

C.
using the Booking tab in the Cisco TelePresence Management Suite to configure a new
conference

D.
using the Cisco TelePresence Management Suite Scheduler to schedule a conference
call to start in 5 minutes

E.
Cisco TelePresence Multiway with Cisco TelePresence Multipoint Control Unit and Cisco
TelePresence Video Communications Server