The general solution of the differential equation \( (y^{2} + x^{3})dx - xydy = 0(x \neq 0) \) is: (where \( c \) is a constant of integration).
1
\( y^{2} + 2x^{3} + cx^{2} = 0 \)
2
\( y^{2} + 2x^{3} + cx^{3} = 0 \)
3
\( y^{2} - 2x^{3} + cx^{2} = 0 \)
4
\( y^{2} - 2x^{3} + cx^{3} = 0 \)