If A and B are two relations, and A has many records in B as well as B has many records in A, then which one of the following mechanisms, is used to complete its logical design model?
- Add primary key of A in B as foreign key
- Add a new relation C, and place primary of B relation in C as foreign key
- Add the primary key of B in A, and add primary key of A in B as foreign keys
- Add new C, and place primary key of B in C, and place primary key of A in C as foreign keys