Dubs of Radio Commercials Are Created

Dubs of radio commercials are created:

A) as audio storyboards for advertisers.
B) in the postproduction phase of radio commercial production.
C) as a form of speculative presentation during the commercial bidding process.
D) as special effects are superimposed on the commercial once the copy has been read.
E) to measure the volume of the commercial to ensure compliance with FCC regulations.