Figure $1.$ FAA Birdstrike Data ERD

A real estate company has customers fill out a "registration & interests" form to provide the real estate agent with

contact data plus information on the types of homes the customer may be interested in$.$ A customer may be interested

in multiple neighborhoods. The real estate company has different agents. Each customer is assigned an agent in the

company. The company has a collection of currently available $($for sale$)$ properties and keeps track of any property

visited by a customer as well as the visit outcome $($not interested, interested, offer made, offer not accepted, offer

accepted, under contract, closed$).$ In Figure $1$ of the handout, only the PK fields have been marked as required. In the Customer Interests table, should the field "CustID" in fact be required?