If $f(x) = \begin{cases} 0, & x = 0 \\ x - 3, & x > 0 \end{cases}$,then $f(x)$ is:
- AAn increasing function for $x \geq 0$.
- B$A$ strictly increasing function for $x > 0$.
- C$A$ strictly decreasing function at $x = 0$.
- DNot continuous at $x = 0$,therefore it is not an increasing function for $x > 0$.
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