Which statement is correct when discussing the source of light for a Cisco TelePresence endpoint?

A.
Key light is the primary source of lighting and typically the strongest source of lighting that is
provided by the overhead lights in the room.

B.
Fill light is created primarily from the indirect overhead lights in the room.

C.
Fill light will cause shadowing on the conference participants.

D.
Back light is mandatory lighting that is projected behind the conference participants to create
separation between the participants and the room background.