(20 POINTS) Which statement BEST explains how RNA polymerase knows where to start & stop making an RNA copy of DNA?

-The enzyme proofreads each DNA strand to help ensure each molecule is copied exactly in the order of the original strand

-The enzyme binds to a sequence of nucleotides called introns they are cut out before they become functional

-The enzyme splices exons together before transcription begins to form the final mRNA molecule

-The enzyme only binds to regions of DNA known as promoters, which have specific base sequences