Which of the following statements are true?

(a) Margin is a price paid to the bank to compensate it for taking on credit risk.

(b) If you hold a forward purchase contract for jpy that you wish to reverse, and the jpy has increased in value, you owe the bank the discounted difference between the current forward rate and the historic forward rate, that is, the market value.

(c) If the balance in your margin account is not sufficient to cover the losses on your forward contract and you fail to post additional margin, the bank must speculate in order to recover the losses.