Increasing decreasing


@pratimejaiswal Ans should be B as for f'(c) to exist, f should be a differentiable function
But if it is a more than one answer question, then A will also be the answer as differentiable func are continuous func

@mohdsabirshaikh but ans is given d

@pratimejaiswal
already you saying f’(c) greater than zero then it implies that f ‘ exist that it derivable.
now if function is derivable then at c , for increasing f’ > 0.
but if it is increasing then even with f’=0 and f’ positive in rigjt and left of c, it can be increasing