With Regard to RNA Polymerase Proofreading Ability,which of the Following

Multiple Choice

With regard to RNA polymerase proofreading ability,which of the following is correct?

A) It is a very stringent activity, no tolerance for mistakes.
B) It is similar to that of DNA polymerases.
C) There are specialized mRNA repair pathways that fix errors.
D) There is absolutely no proofreading that needs to be done.
E) The 3' → 5' exonuclease activity is sufficient.