Database Management Systems·Relational Model·FoundationThe delete the database refusedorders.customer_id is a foreign key to customers.id. Deleting a customer who has orders is refused.Why?AThe customer row is locked by the orders that reference itBForeign keys make rows read-only once referencedCAllowing it would leave orders pointing at a customer that no longer existsDThe orders must be deleted first because they were created laterCheck answer