Let pk(R) denotes primary key of relation R. A many-to-one relationship that exists between two relations R₁ and R₂ can be expressed as follows :
(A) pk(R₂) → pk(R₁)
(B) pk(R₁) → pk(R₂)
(C) pk(R₂) → R₁ ∩ R₂
(D) pk(R₁) → R₁ ∩ R₂


Answer: (B)

Explanation:

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