If f(x,y,z)=x2yezf(x, y, z) = x^2 y e^zf(x,y,z)=x2yez, what is the second-order partial derivative fxyzf_{xyz}fxyz?
2xez2x e^z2xez
2yez2y e^z2yez
x2ezx^2 e^zx2ez