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QUESTION 5 The optimal combination of two inputs, K and L, can be characterized by: O a. PKMPK = PLMPL b. MPK = MPL O c. PLMPK = PKMPL O d. MPK IMPL = PLIPK O e. none of the above QUESTION 6 The production function is Q = K .6 L .4. The marginal rate of technical substitution is: O 2/3 K-1 L. OK- 1 L-1 . O 2/3 K L-1. OK. 4 L-6