What conditions must be met to ensure that a function has an absolute maximum value and an absolute minimum value on an interval? Choose the correct answer below. The function must be continuous on a closed interval [a,b]. O y o o w F A critical point must occur on a closed interval on [a,b]. O The function must be continuous for some subinterval on [a,b]. O The function must be continuous on an open interval (a,b). \f