Q. Referential integrity means (Solved)

1. Do not enter a value in the foreign key field of a child table if that value does not exist in the primary key of the parent table

2. Do not enter a value in the primary key field of child table if that value does not exist in the primary key of the parent table

3. Do not enter a value in the foreign key field of a parent table if that value does not exist in the primary key of the child table

4. All of above