Let R and S be two relations with the following schemaR (P, Q, R1, R2, R3)S (P, Q, S1, S2)Where {P, Q} is the key for both schemas. Which of the following queries are equivalent?I) ΠP (R ⋈ S)II) ΠP (R) ⋈ ΠP (S)III) ΠP (ΠP, Q (R) ∩ ΠP, Q (S))IV) ΠP (ΠP, Q (R) - (ΠP, Q (R) - ΠP, Q (S)))

• A. Only I) and II)
• B. Only I) and III)
• C. Only I), II) and III)
• D. Only I), III) and IV)