The objective of an investment is to maximize return. If dual price for a constraint that compares funds used with funds available is $\mathrm{.}058.$ This means that

a$.$ the cost of additional funds is $5\mathrm{.}8\%.$

b$.$ no more funds are needed.

c$.$ if more funds can be obtained at a rate of $5\mathrm{.}5\%,$ some should be$.$

d$.$ the objective was to minimize.