The restriction x11,x12, x21, x22 ≥ 0 in the model means:

a. Each decision variable must be positive in the optimal solution.
b. Each decision variable must be nonnegative in the optimal solution.
c. x11+ x12 + x21 + x22 ≥ 0
d. All of the above
e. None of the above

This constraint or restriction states that x11, x12, x21, and x22 all must be at least 0 or greater. in other words, they cannot be negative numbers. If the restriction had been > (greater than), then it would mean that all the variables must be positive numbers. But since it is ≥ (greater than or equal to), 0 is a valid option.

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The restriction x11,x12, x21, x22 ≥ 0 in the model means: a. Each decision variable must be positive in the optimal solution. b. Each decision variable must be nonnegative in the optimal solution. c. x11+ x12 + x21 + x22 ≥ 0 d. All of the above e. None of the above

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The restriction x11,x12, x21, x22 ≥ 0 in the model means:

a. Each decision variable must be positive in the optimal solution.
b. Each decision variable must be nonnegative in the optimal solution.
c. x11+ x12 + x21 + x22 ≥ 0
d. All of the above
e. None of the above