Which of the following two statements about ordinary annuiti

Which of the following two statements about ordinary annuities is/are true?

A) The frequency of payments and the frequency of interest compounding will always be the same.

B) Payments are always made at the end of each payment period.

a. Only statement A is correct

b. Only statement B is corret

c. Neither of them are correct

d. Both of them are correct

D Both statement A and statement B are true is correct

nothing to explain as they are part of definition