Discuss the conditions required to ensure the Referential Integrity? There are 2 correct answers to this question

Discuss the conditions required to ensure the Referential Integrity? There are 2 correct answers to this question
A . There are three joins in the table
B . Referential integrity holds true in both the directions
C . There is at least one join in the other table
D . There are two joins in the table

Answer: B,C