DJ refers to Disc Jockey, Scooter Braun is not a mash-up DJ.
The word "disc jockey" was allegedly invented by radio gossip columnist Walter Winchell in 1935, and it first appeared in print in a 1941 Variety magazine, referring to radio personalities who played records on the air.
Except for Scooter Braun, every given option is mash-up DJs.
Therefore, option c) is not the DJs.
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