6. 8 2 5. 2. 3 4 9. 1 1 3, 20 4. 4. The input- output constraint associated with the first node of the network diagram for integer linear programming formulation of the maximal flow problem is: a. X12 + x13 + x14 = X91 b. X12 +X13 + x14 + X91 = 0 %3D O c. none of the mentioned O d. X12 + x13-X14 = 0 O e. X12 + x13 + x14 = 0 2/3

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