(a) Application of purchases and sales. Any banking institution 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 shall:

(i) Immediately apply such purchase or sale against such previously held opposite transaction with the same customer; 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 banking institution shall 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, the offsetting transaction shall be applied as directed by a retail forex customer's specific instructions. These instructions may not be made by the banking institution or a related person.