Let $f(x) = \begin{cases} \frac{1}{2}, & \text{if } 0 \le x \le \frac{1}{2} \\ \frac{1}{3}, & \text{if } \frac{1}{2} < x \le 1 \end{cases}$,then $f$ is
- A$A$ rational function
- B$A$ trigonometric function
- C$A$ step function
- DAn exponential function
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