What is the other component ‘v’ of velocity?

Question

In a two-dimensional incompressible steady flow, the velocity component u = Ae^x is obtained. What is the other component ‘v’ of velocity?

(a) v = Ae^xy                

(b) v = Ae^y                   

(c) v =-Ae^xy + f(x)     

(d) v = -Ae^yx + f(y)