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How might information about this function​ (such as the shape of the​ isoquants) help the campaign manager plan​ strategy?A.If television advertisements and letters to potential voters are perfect complements​, then the campaign manager should use only the cheaper input per voteonly the cheaper input per vote.B.If television advertisements and letters to potential voters are perfect substitutes​, then the campaign manager should use only the cheaper input per voteonly the cheaper input per vote.C.If the isoquant curves for television advertisements and letters to potential voters are​ convex, then the campaign manager should use them in fixed proportionsthem in fixed proportions.D.If the marginal rate of technical substitution of television advertisements for letters to potential voters is decreasing​, then the campaign manager should use only the cheaper input per vote only the cheaper input per vote.E.If the isocost lines for television advertisements and letters to potential voters are​ convex, then the campaign manager should use a combination of the two inputs.

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