[Answer] The epsilon (ε) subunit of DNA polymerase III of E. coli has exonuclease activity. How does it function in the proofreading process? The epsilon subunit ________.A) removes a mismatched nucleotideB) excises a segment of DNA around the mismatched baseC) can recognize which strand is the template or parent strand and which is the new strand of DNA.D) adds nucleotide triphosphates to the 3′ end of the growing DNA strand