Write the basic solution for the simplex tableau determined by setting the nonbasic variables equal to 0. 

A. x1 = 9, x2 = 0, x3 = 18, x4 = 15, x5 = 1, z = 12
B. x1 = 0, x2 = -3, x3 = 0, x4 = 0, x5 = 1, z = 1
C. x1 = 9, x2 = 0, x3 = 18, x4 = 15, x5 = 1, z = 0
D. x1 = 9, x2 = 0, x3 = 18, x4 = 15, x5 = 0, z = 12


Answer: D

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