The solution of $(1+x^2) \large\frac{dy}{dx}$$+2xy-4x^2=0$ is :

Question

$$\begin {array} {1 1} (a)\;3x(1+y^2)=4y^3+c & \quad (b)\;3y(1+x^2)=4x^3+c \\ (c)\;3x(1-y^2)=4y^3+c & \quad (d)\;3y(1+y^2)=4x^3+c \end {array}$$