Select the correct statements below about the inverse factor demand functions. Choose one or more: A. Inverse factor-demand functions are used only in the short run (i.e., when at least one input or factor is held constant). B. The inverse factor-demand functions measure how much of an input is demanded at every possible factor price. C. The inverse factor-demand functions measure what the input (factor) prices must be for some given quantity of inputs to be demanded. D. In the case of two inputs (factors), with one of them being held constant, the inverse factor-demand function can be thought of as the condition that an input should be bought up to the point where the marginal value of that input equals the marginal cost