Consider the following schedules involving two transactions. Which one of the following statements is TRUE?

S₁ : r₁ (X); r₁ (Y); r₂ (X); r₂ (Y); w₂ (Y); W₁ (X) S₂ : r₁ (X); r₂ (Y); r₂ (X); w₂ (Y); r₁ (Y); W₁ (X)

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