The solution of $\large\frac{dy}{dx}=\frac{y^2}{xy-x^2}$ is

Question

$$\begin {array} {1 1} (a)\;e^{y/x}=kx & \quad (b)\;e^{y/x}=ky \\ (c)\;e^{x/y}=kx & \quad (d)\;e^{-y/x}=ky \end {array}$$