​Let M Represent the Absolute Maximum of F(x)in an Interval

Multiple Choice

​Let M represent the absolute maximum of f(x) in an interval. Let R represent a root of f(x) in the given interval.
Let m represent the absolute minimum of f(x) in the interval.
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If ,then which of the following is true over the closed interval ?
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A) ​M and R occur at a critical point and m occurs at an endpoint.
B) ​M and m occur at critical points.
C) ​M,m,and R occur at endpoints of the given interval.
D) ​M occurs at an endpoint,whereas m and R occur at a critical point.