What is the minimum room size recommended for the Cisco TelePresence System 1300 with a short race track style table?

What is the minimum room size recommended for the Cisco TelePresence System 1300 with a short race track style table?

A.
15 feet wide by 13 feet deep

B.
18 feet wide by 13 feet deep

C.
19 feet wide by 13 feet deep

D.
23 feet wide by 13 feet deep