Teaching TN TRB CS Mock Test DBMS Query Language Relational Model

A relation R(PQ) has primary key is Q and P is a foreign key refining the same relation R. Which of the following row sequence can be inserted into R?

1
(b1, b1), (b1, b2), (b0, b3), (b3, b4)
2
(b2, b1), (b1, b2), (NULL, b3), (b3, b4)
3
(b2, NULL), (b1, b2), (b2, b3), (b3, b4)
4
(b2, b1), (b1, b2), (b4, b1), (b3, b4)
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