Under what conditions do the following production functions exhibit decreasing, constant, or increasing returns to scale? The production function q=L+K O A. exhibits increasing returns to scale if L and K are greater than one. OB. exhibits decreasing returns to scale if L and Kare less than one. C. always exhibits constant returms to scale. D. always exhibits increasing returns to scale. OE. always exhibits decreasing returns to scale. The production function q=Lkb O A. always exhibits increasing returns to scale. B. always exhibits decreasing returns to scale. C. exhibits increasing returms to scale if a + b>1 and decreasing returns to scale if a +b 1 and increasing returns to scale if a +b 0 and decreasing returns to scale if a +b 1 and decreasing returns to scale if a +b 1 and increasing returns to scale if a +b 0 and constant retums to scale if a+b=0.