A)It binds to Rpb3 to facilitate melting of the DNA promoter. B)It extends the dock region of polymerase,making it easier for transcription factors to bind. C)It binds to DNA and facilitate elongation. D)It binds to Rpb3 to facilitate melting of the DNA promoter and it extends the dock region of polymerase,making it easier for transcription factors to bind are correct. E)It extends the dock region of polymerase,making it easier for transcription factors to bind and it binds to DNA and facilitate elongation are correct.