If $\cos ^{-1} x = y$,then . . . . . . .
- A$-\frac{\pi}{2} < y < \frac{\pi}{2}$
- B$-\frac{\pi}{2} \leq y \leq \frac{\pi}{2}$
- C$0 < y < \pi$
- D$0 \leq y \leq \pi$
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