20 Let no be a local minimum point of a function f: BB. It's true that: a) there exist ε>0 such that, for all x€ (20 - ε, 2+ε), f(x) > f (x). b) there exist ε>0 such that, for all x€ (20 - ε, 2+ε), f(x) = f (xo) c) f is continuous at xo d) f' (20) = 0 f'(x) e) for all xER, f(x) = f(20)

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