Which of the following statements about the correction of errors in dna replication is/are correct? choose all that apply. a) 3'-5' exonuclease activity results in 100-fold reduction in error rates. b) dna polymerases have 3'-5' exonuclease activity. c) 3'-5' exonuclease activity depends on the methylation state of the dna strand. d) e. coli does not methylate dna in a particular region once replication has occurred in that region. e) the methylation sequence in e. coli recognized by a particular methylase is 5'-gatc-3'.