If $f: R \rightarrow R$ is defined by $f(x)=x^{3}$,then $f^{-1}(8)$ is equal to
- A$\{2\}$
- B$\{2, 2\omega, 2\omega^{2}\}$
- C$\{2, -2\}$
- D$\{2, 2\}$
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