Assuming that all units of a variable input are of equal quality, as more variable inputs are added to fixed inputs...

Group of answer choices

The marginal product of the variable inputs might increase at first (due to gains from specialization), but will eventually decrease.

The marginal product of the variable inputs might decrease at first, but will eventually increase.

The marginal product of the variable inputs will continually increase due to gains from specialization.

The marginal product of the variable inputs will be constant.