4. Suppose that a perfectly competitive output manufacturer has production function, Q = f(K, L). The labor market is perfectly competitive, and

there is a capital monopolist. Which of the following is TRUE?

(a) The capital monopolist always has incentive to integrate forward, regardless of the form of f(K, L).

(b) The capital monopolist has incentive to integrate forward when f(K, L) = min{K, L}.

(c) The capital monopolist has incentive to integrate forward when f(K, L) = K + L.

(d) More than one of the above.