When Used in Reference to Producing a Radio Commercial, the Term

When used in reference to producing a radio commercial, the term "session" means the:

A) group of people who are brought together to make the commercial.
B) length of time the final commercial is supposed to last.
C) time when the recording and mixing of a commercial takes place.
D) number of weeks (or months) the commercial is scheduled to be aired.
E) loudness level that is to be used to record the commercial.