Which of the following hold(s) good for ...

Which of the following hold(s) good for the function `f(x)=2x-3x^(2/3)?` (a)`f(x)` has two points of extremum. (b)`f(x)` is convave upward `AAx in Rdot` (c)`f(x)` is non-differentiable function. (d)`f(x)` is continuous function.

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