If $f : R \to R, f(x) = x^2 + 1$, then $f^{-1}(17)$ and $f^{-1}(-3)$ are
If $f : R \to R, f(x) = x^2 + 1$, then $f^{-1}(17)$ and $f^{-1}(-3)$ are
- A
$\{8, -8\}, \{\sqrt 2 \}$
- B
$\{3, -3\}, \phi$
- C
$\{4, -4\}, \phi$
- D
$\phi ,\{4, -4\}$
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- [IIT 1999]
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