Select the true statement regarding DNA repair mechanisms Select one: a. The proofreading ability of the RNA polymerase allows it to replace nucleotides that it erroneously wrote b. Mismatch repair and Excision repair are used when DNA is damaged by environmental exogenous factors c. DNA polymerase III is responsible for DNA proofreading and Excision repair d. Both DNA polymerases I and III have proofreading capabilities e. RNA Damage caused by free radicals is corrected by mismatch repair