In the given network of AND and OR gates, f can be written as

(A) X₀X₁X₂ … X_n + X₁X₂ … X_n + X₂X₃ … X_n + ⋯ + X_n
(B) X₀X₁ + X₂X₃ + … X_n-1 X_n
(C) X₀ + X₁ + X₂ + … + X_n
(D) X₀X₁ + X₃ … X_n−1 + X₂X₃ + X₅ … X_n−1 + ⋯ + X_n−2X_n−1 + X_n

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