For which functions doesfy=xe^xy6xy+4? Choose all that apply

a.

f(x,y)=e^xy6x

b.

f(x,y)=xye^xy3xy^2+4x

c.

f(x,y)=e^xy3xy^2+4y+4

d.

f(x,y)=e^xy6xy+4y

e.

f(x,y)=e^xy3xy^2+4y