The goal programming problem with the objective function Min P1(d1+) + P2(d2?) is initially solved by the computer and the objective function value is 0. Which of the following constraints should be added for the second problem?
a. d1+ = 0
b. d1+ + d2? = 0
c. ?d1+ + d2? = 0
d. d1+ ? 0
a. d1+ = 0
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