Let F(x, Y, Z) = Xyz(1 $\text { eyz }$

Multiple Choice

Let f(x, y, z) = xyz(1 + $\text { eyz }$
) . Find $\frac { \partial f } { \partial z }$ .

A) xy(1 + $\text { eyz }$ ) + $x y ^ { 2 }$ $\text { zeyz }$
B) xy(1 + $e ^ { y }$ )
C) xy(1 + $\text { eyz }$ ) + xy(1 + y $\text { eyz }$ )
D) xy(1 + )
E) none of these