Which of the following descriptions about DNA and RNA polymerase are correct:
选项：

A:RNA polymerase synthesize RNA chain using nucleoside diphosphate instead of nucleoside triphosphates.
B:RNA polymerase can initiate transcription without a primer, and nucleotides are added to 5’ end of the growing RNA chain.
C:RNA polymerase can add nucleotides in both 3’ or 5’ end of RNA chain.
D:Both RNA polymerase and DNA polymerase can only add nucleotides to 3’ end of the polynucleotides.