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Suppose f(x,y) is the temperature on the surface of the earth at latitude x and longitude y. Suppose f(x,y) 2 f(40, 58) for all (x,y). Which of the following statements is true? O The earth's temperature has a global maximum at (40, 58). O The earth's temperature has a global minimum at (40, 58). O The earth's temperature has a local maximum at (40, 58). O None of the above