Which of the following is true?

Principals are not usually exchanged in a currency swap

The principal amounts usually flow in the opposite direction to interest payments at the beginning of a currency swap and in the same direction as interest payments at the end of the swap.

The principal amounts usually flow in the same direction as interest payments at the beginning of a currency swap and in the opposite direction to interest payments at the end of the swap.

Principals are not usually specified in a currency swap