(a) Application of purchases and sales. Any national bank that—

(1) Engages in a retail forex transaction involving the purchase of any currency for the account of any retail forex customer when the account of such retail forex customer at the time of such purchase has an open retail forex transaction for the sale of the same currency;

(2) Engages in a retail forex transaction involving the sale of any currency for the account of any retail forex customer when the account of such retail forex customer at the time of such sale has an open retail forex transaction for the purchase of the same currency;

(3) Purchases a put or call option involving foreign currency for the account of any retail forex customer when the account of such retail forex customer at the time of such purchase has a short put or call option position with the same underlying currency, strike price, and expiration date as that purchased; or

(4) Sells a put or call option involving foreign currency for the account of any retail forex customer when the account of such retail forex customer at the time of such sale has a long put or call option position with the same underlying currency, strike price, and expiration date as that sold must:

(i) Immediately apply such purchase or sale against such previously held opposite transaction; and

(ii) Promptly furnish such retail forex customer with a statement showing the financial result of the transactions involved and the name of any introducing broker to the account.

(b) Close-out against oldest open position. In all instances in which the short or long position in a customer's retail forex account immediately prior to an offsetting purchase or sale is greater than the quantity purchased or sold, the national bank must apply such offsetting purchase or sale to the oldest portion of the previously held short or long position.

(c) Transactions to be applied as directed by customer. Notwithstanding paragraphs (a) and (b) of this section, to the extent the national bank allows retail forex customers to use other methods of offsetting retail forex transactions, the offsetting transaction must be applied as directed by a retail forex customer's specific instructions. These instructions may not be made by the national bank or an IAP of the national bank.