How would you answer an interview scenario involving relationships and navigation properties in Entity Framework Core?

For an interview scenario involving relationships and navigation properties, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. EF Core maps one-to-one, one-to-many, and many-to-many relationships through keys and navigation properties. In this scenario, model Customer, Order, and OrderItem and explain the foreign keys and delete behavior you would choose. For production, configure important relationships explicitly, choose delete behavior deliberately, and test referential integrity. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.