In the Cobb-Douglas Production Function ( ):
A)the Marginal $\beta$

In the Cobb-Douglas production function ( ) :

A) the marginal product of labor (L) is equal to $\beta$ 1
B) the average product of labor (L) is equal to $\beta$ 2
C) if the amount of labor input (L) is increased by 1 percent,the output will increase by $\beta$ 1 percent
D) a and b
E) a and c