Which two of these support an ad-hoc conference call?

A.	Cisco TelePresence Multiway with Cisco TelePresence Multipoint Control Unit and Cisco TelePresence Video Communications Server
B.	using the Cisco TelePresence Management Suite Scheduler to schedule a conference call to start in 5 minutes
C.	using the Booking tab in the Cisco TelePresence Management Suite to configure a new conference
D.	using the tab Administrative Tools > Configuration > Conference Settings in the Cisco TelePresence Management Suite
E.	pressing the conference button on a Cisco Unified IP Phone 8941 to conference in a third call