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