Which Statement Is Not True About the Bacterial Sigma Factor

Which statement is not true about the bacterial sigma factor?

A) Sigma is a regulatory protein, which is required for the initiation of transcription.
B) Sigma has the ability to join ribonucleotides (NTPs) by phosphodiester bonds using DNA as a template.
C) Sigma properly orients the RNA polymerase complex for transcription at the gene start site.
D) After initiation is complete, sigma does not dissociate completely; some domains are displaced and mRNA synthesis continues.