Viacom (NasdaqGS: VIAB - news ) fell 7.5 percent, 21st Century Fox lost 7.0 percent, CBS shed 4.6 percent and Comcast dropped 4.7 percent.
Refer to the input text as context and select the correct relationship between 'Viacom' and 'CBS' from the available options.
Options: original broadcaster, stock exchange, owned by, distribution format