DBMS Query Language Relational Algebra

For two union compatible relations R1 (A, B) and R2 (C, D), what is the result of the operation R1 ⋈ (A=C ∧ B=D) R2?

1
R1 ∪ R2
2
R1 × R2
3
R1 - R2
4
R1 ∩ R2
5
Question Not Attempted

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