Which of the Following Describes a Major Way in Which

Which of the following describes a major way in which currency swaps differ from interest-rate swaps?

A) The notional amount is exchanged in a currency swap, but not in an interest-rate swap
B) Currency swaps include only interest payments in more than one currency
C) Interest-rate swaps may include more than one currency, currency swaps include one currency
D) The notional amount is exchanged in an interest-rate swap, but not in a currency swap