Mutations Are Hazardous to the Health of E

Mutations are hazardous to the health of E.coli (and Homo sapiens as well) .To reduce this health hazard, E.coli employs:

A) The 3' --> 5' endonuclease activity of DNA polymerase I.
B) The 5' --> 3' exonuclease activity of DNA polymerase III.
C) The 3' --> 5' exonuclease activity of DNA polymerase III.
D) The 3'--> 5' exonuclease activity of DNA polymerase II.
E) The 5' --> 3' endonuclease activity of DNA polymerase I.