At a Certain Factory, the Output Q Is Related to Inputs

Multiple Choice

At a certain factory, the output Q is related to inputs x and y by the expression $Q ( x , y ) = 9 x ^ { 2 } + 6 x ^ { 3 } y ^ { 4 } + 4 y ^ { 4 }$ . If 0 $\le$ x $\le$ 4 and 0 $\le$ y $\le$ 3, what is the average output of the factory? (Approximate to 2 decimal places.)

A) 1,669.33 units
B) 536.07 units
C) 2,226.60 units
D) 1,668.00 units