Which statement is correct when discussing room materials for a Cisco Telepresence room?

A.
The audio subsystem is not designed to deliver excellent performance to normal drywall room surfaces

B.
Standard drywall walls with a smooth finish are preferred

C.
Walls and wall coverings with a heavy texture are encouraged

D.
Cinder block and brick can be highly reverberant and therefore will likely require a coat of paint

E.
Thin walls and doors should be enough to block unwanted sound from leaking into the room