Question 1: Modelling with event based gateways

Draw a BPMN diagram of the following process from the mortgage provider's perspective. Use one white box pool for the mortgage provider and a black box pool for the customer.

Description of the process: The process starts once a mortgage application has been approved. The Customer Service Representative sends a mortgage offer to the customer and waits for a response. There are three possibilities at this stage - the customer can decline the offer, the customer accepts the offer or there is no response after 3 weeks.

If the customer calls or writes back declining the mortgage, the customer representative updates the case details, archives the information and then cancels the mortgage offer.

If there is no response from the customer within 3 weeks, then the customer representative updates the case details, archives the information and then cancels the mortgage offer.

If the customer sends back the signed offer (i.e. accepted offer), then the customer representative passes the file to an administrator who checks if the customer has included all the required documents. If all required documents have been included, then the administrator finalises the mortgage. If all documents are not included, then the administrator requests the outstanding documentation from the customer. If the customer sends the required documents within 3 weeks, then the administrator again checks for completeness. If there is no response within 3 weeks, then the administrator cancels the mortgage offer and archives the information.

Please answer the question in detail and explain or describe every steps.