When a Bank Participates in a Swap of Fixed Interest

When a bank participates in a swap of fixed interest rate payments for floating-rate payments, or a swap of currencies, it

A) can match up two parties but cannot take a position in the swap.
B) can match up two parties or can take a position in the swap.
C) cannot match up two parties and cannot take a position in the swap.
D) cannot match up two parties but can take a position in the swap.