On expiry of the contract or before the due date, the agreed price (called the strike price or exercise price) according to the subject matter of the agreement to sell. Purchaser is entitled to sell the subject of the lease were sold. Likewise sold option is to give the purchaser the right so that it can before the expiration date for a certain strike price to sell a certain number or a certain time of delivery subject of the lease. When buyers want to exercise the put option, were sold put options shall bear the obligation to buy the underlying contract site.