Discussion
If dual has an unbounded solution, then its corresponding primal has
Answer: A
If the dual problem has an unbounded solution, then the primal problem has no feasible solution. By the duality theorem, a feasible primal with a bounded objective gives a dual with the same optimum, and if one problem is unbounded, the other cannot have any feasible point at all. A primal with an unbounded solution would need the dual to be infeasible, which is the converse, and a feasible primal would force a bounded dual. The keyed answer is no feasible solution.
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