Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

The notional principal of a swap is:
Option A:not exchanged in the case of an interest rate swap.
Option B:a fixed amount whenever it is matched with a loan.
Option C:equal to the amount owed by one swap party to the other.

Answer: A