Let $f(x)=(x+1)^2-1, x \geqslant-1$,then the set $\{x : f(x)=f^{-1}(x)\}$ is
- A$\{0, 1, -1\}$
- B$\{0, -1\}$
- C$\{0, -1, \frac{-3+i \sqrt{3}}{2}, \frac{-3-i \sqrt{3}}{2}\}$
- D$\phi$
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