Let W(A, B) and Q(C,D) be two relation schemas. Let r₁ and r2 be the corresponding relation instances. B is a foreign key that refers to C in r2. Assuming that all tuples in r₁ and r2 satisfy referential integrity constraints, which of the following is ALWAYS TRUE? (А) Пв (1) - Пс (rz) =Ø (В) Пс (г) - Пв (г1 ) =Ø (С) Пв (г1) = Пс (12) (D) IIB (1₁) - IIc (1₂) *Ø B A

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