Which of the Following Is True of Pol II

Which of the following is true of pol II?

A) It must be in its phosphorylated form to cause both the initiation and elongation.
B) It must be in its dephosphorylated form to cause both the initiation and elongation.
C) It must be in its phosphorylated form to initiate transcription but must be in its dephosphorylated form to cause elongation.
D) It must be in its dephosphorylated form to initiate transcription but must be in its phosphorylated form to cause elongation.