When a Production Function Can Be Expressed As $$Q = \min \{ a K , B L \}$$

Multiple Choice

When a production function can be expressed as $$Q = \min \{ a K , B L \}$$ ,the relationship between capital and labor in the production function is that:

A) capital and labor are perfect substitutes, and the isoquants are linear.
B) capital and labor must be combined in fixed proportions, and the isoquants are L-shaped.
C) capital and labor are easily substituted, and the isoquants are convex to the origin.
D) capital and labor are perfect substitutes, and the isoquants are L-shaped.