If f (x) >0 and f (x)< 0 for all x over a given part of the domain of a function f, then the graph of f over this part of the domain would be a curve which A increases, having increasing gradient with increasing x B decreases, having increasing gradient with increasing x C increases, having decreasing gradient with increasing x D decreases, having decreasing gradient with increasing x E increases, having a non-stationary point of inflection

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Q: determine at which points, the function f(x)=x2 if x∈Q if x and f(x)=-x2 if x∈R/Q is continuous.

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