Ex 4.26Model the following business process.An order handling process starts when an order is received. The order is first registered.If the current date is not a working day, the process waits until the following workingday before proceeding. Otherwise, an availability check is performed and a purchase orderresponse is sent back to the customer. If none of the items is available, any processingrelated to the order must be stopped. Thereafter, the client needs to be notified that thepurchase order cannot be further processed. Anytime during the process, the customer maysend a purchase order cancel request. When such a request is received, the purchase orderhandling process is interrupted and the cancelation is processed. The customer may alsosend a Customer address change request during the order handling process. When such arequest is received, it is just registered without further action.