HElp with my bio PLZ~?

Question

In DNA replication, phosphodiester bonds are formed between the _______ of the incoming nucleotide and the _______ of the previously added nucleotide.

a. 5'-phosphate / 3'-hydroxyl
b. 3'-phosphate / 5'-hydroxyl
c. 5'-hydroxyl / 3'-phosphate
d. 3'-hydroxyl / 5'-phosphate
e. None of the above.
Actually, I am confused by the question

Answer 1

Refer to page 118 of your course notes.