Which characteristic is exhibited by transcription-termination signals found at the ends of most bacterial operons,such as the trp operon?

A) They encode a nascent RNA with the potential to form hydrogen-bonded hairpin structures.
B) They contain the operator region to which the repressor binds to shut off transcription.
C) They contain the site for the binding of the CAP-cAMP complex to affect catabolite repression.
D) They contain the binding site for the repressor-corepressor complex.
E) They begin with the sequence ATG.