Consider the following statements when answering this question.
I. A firm's expansion path represents labor and capital inputs that minimize the cost of production associated with each output level.
II. If a firm uses only two factors of production, one of whose marginal product becomes negative when its use exceeds a certain level, then a cost-minimizing firm's expansion path will have vertical or horizontal segments.
A) I is true, and II is false.
B) I is false, and II is true.
C) Both I and II are true.
D) Both I and II are false.