The general solution of $\frac{d y}{d x}+y f^{\prime}(x)-f(x) f^{\prime}(x)=0$, $y \neq f(x)$ is
- A$y=f(x)+1+c e^{-f(x)}$
- B$y=c e^{-f(x)}$
- C$y=f(x)-1+c e^{-f(x)}$
- D$y=f(x)+c e^{f(x)}$
✓ Correct answer: C
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