2. Transaction code. Call option: AL- contract month -C- exercise price, put option: AL- contract month -P- exercise price.
3. Option type. The aluminum option listed in China is an American option, and the buyer can submit the exercise application at any trading time before the expiration date.
4. The last trading day. As the penultimate trading day of the first month before the delivery month of the underlying futures contract, the exchange may adjust the last trading day according to the national legal holidays.
5. Due date. The expiration date is the same as the last trading day.