K Use the simplex method to solve the linear programming problem. Z = X₁ +5x₂ + x3 +7x4 X₁ + 9x2 + 7x₁ + x₂ + x₁20, X₂20, x3 20, x4 20 Maximize subject to x3 + x4 ≤60 3x3 + x4≤180 Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. A. The maximum is when x₁ = x₂ = x3 = x₁ = . $₁=₁ and $₂ = 0 B. There is no maximum.

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