4: Which of the following functions has gradient vector [4x₁x₂ 2x² 3x²]¹? A: f (X) = 2x{+2x3+x3x3 B: f(x) = 2x²x₂ + x² C: f(x) = 2x²x₁ + x² D: Non of these O A О в О с O D

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