Which of the Following Are Biochemical Features of RNA Polymerase

Multiple Choice

Which of the following are biochemical features of RNA polymerase? 1.5'->3' polymerase activity.
2) Recognition of a promoter sequence to initiate transcription with help from factors.
3) Local unwinding of DNA,called a transcription bubble,provides a template for enzymatic activity.

A) 1
B) 2
C) 3
D) 2 and 3
E) All of these