Problem $1$: Model the control flow of the following business process for mortgage application from the point of view of the mortgage company $($that is$,$ assume $1$ pool$).(25$ pts$)$A Customer Service Representative receives an inquiry from a customer about a home mortgage. If they mutually agree to proceed with the application, the representative will gather the necessary documents from them. If they do not agree to proceed $($because either the customer is not interested or the customer does not meet basic qualifications$),$ the representative will update the customer data in their system and the case is considered complete. Once the necessary documents have been gathered the representative sends the document package to the Underwriter. The underwriter will assess the documents. If additional documents are needed from the customer, theunderwriter will work with the customer to gather additional documents and then reassess. This can happen multiple times. Once all needed documents have been received, the underwriter will approve or disapprove the loan. If it is approved, the underwriter will finalize the loan, and then the customer is notified of that by the Customer Service Representative. The case is then complete. If the mortgage is not approved, the customer is notified of that by the Customer Service Representative and the case is considered complete.