By Convention, a Swap Buyer on an Interest Rate Swap

By convention, a swap buyer on an interest rate swap agrees to

A) periodically pay a fixed rate of interest and receive a floating rate of interest.
B) periodically pay a floating rate of interest and receive a fixed rate of interest.
C) swap both principle and interest at contract maturity.
D) back both sides of the swap agreement.
E) act as the dealer in the swap agreement.