Let h(g1, 92) be a continuous function through a nonempty, closed and bounded set S. Are these conditions necessary, sufficient, necessary and sufficient or neither necessary nor sufficient conditions to ensure that there exists points (a, b) and (c, d) in S where h has a minimum and a maximum value, respectively? O Necessary and sufficient O Sufficient, but not necessary O Neither necessary nor sufficient O Necessary, but not sufficient O None of the above O No answer

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