If $f(x) = \begin{cases} [x] & \text{if } -3 < x \leq -1 \\ |x| & \text{if } -1 < x < 1 \\ |[x]| & \text{if } 1 \leq x < 3 \end{cases}$,then the set $\{x : f(x) \geq 0\}$ is equal to
- A$(-1, 3)$
- B$[-1, 3)$
- C$(-1, 3]$
- D$[0, 3)$
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DifficultKVPY 2019
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