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 value of a swap is equal to the present value of the:
Option A:fixed payments from the swap.
Option B:net cash flow payments from the swap.
Option C:underlying at the end of the contract.

Answer: B