How can methylation affect transcription? a. It may prevent the binding of regulatory transcription factors. b. It may enhance the binding of regulatory transcription factors. c. It may promote the...

How can methylation affect transcription?
a. It may prevent the binding of regulatory transcription factors.
b. It may enhance the binding of regulatory transcription factors.
c. It may promote the binding of methyl-CpG-binding proteins,
which inhibit transcription.
d. All of the above are possible ways for methylation to affect
transcription.