A firm uses capital and labor. Profit is maximized when:
I. P × MPL = PL.
II. P × MPK = PK.
III. MPL/PL = MPK/PK.
IV. PK × APK = P.
Which of the following is correct?
a. I only.
b. II only.
c. I and II only.
d. I, II and III only.
e. All of the above.
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