The differential equation whose solution represents the family $x^2 y = 4e^x + c$,where $c$ is an arbitrary constant,is
- A$x \frac{dy}{dx} + xy = 0$
- B$x^2 \frac{dy}{dx} + (2xy - 4e^x) = 0$
- C$x \frac{dy}{dx} + (x - 2)y = 0$
- D$x \frac{dy}{dx} + (2 - x)y = 0$
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