Expiration exercise: Options that expire are generally exercised or expire worthless after the market closes on the expiration date; if the expiration date falls on a holiday, the exercise or expiration time may vary, please refer to your account changes for details. Early exercise: The option holder, i.e., the buyer, does not currently support early exercise of purchased options in the BiyaPay APP; the option writer, i.e., the seller, may be required to exercise early by the holder (buyer) at any time.