Which of the following is correct about the polyadenylation mechanism?

a. A long chain of adenine nucleotides is added to the 3′ end of mRNA during termination of transcription

b. A long chain of uracil nucleotides is added to the 3′ end of mRNA during termination of translation

c.A long chain of guanine nucleotides is added to the 3′ end of mRNA during termination of translation.