Easy
Consider the function $f: [1.2, 1.9] \rightarrow \mathbb{R}$ defined by $f(x) = [x]$,where $[x]$ denotes the greatest integer less than or equal to $x$. Which of the following is true?
- A$f'(x) = 0$
- B$f$ is not differentiable
- C$f$ is discontinuous
- D$f'(x) = 1$
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