4. Which of the following about DNA polymerase I (pol I) is incorrect? (A) Pol I is the polymerase responsible for replicating the bacterial genome. (B) Pol I has three activities: DNA polymerase, 5'→ 3' exonuclease, and 3' → 5' exonuclease. (C) The Klenow fragment does not have 5'→ 3' exonuclease activity. (D) Pol I plays a dominant role in repair of DNA damage. (E) pol I can be cleaved by mild proteolytic treatment into to a large fragment and a small fragment.