Positive and Negative Transcriptional Regulation Differ in That

Positive and negative transcriptional regulation differ in that:

A) positive regulation requires that a promoter be present; a promoter is not necessary in negative regulation.
B) in positive regulation, the binding of a regulatory protein to the DNA is necessary for transcription to occur; in negative regulation, no such protein is necessary.
C) in positive regulation, the binding of a regulatory protein to the DNA is necessary for transcription to occur; in negative regulation, such binding prevents transcription.
D) in positive regulation, the absence of a regulatory protein promotes transcription; in negative regulation, the absence of a regulatory protein promotes transcription.
E) None of the answer options is correct.