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Select all the true statements. A). π is the area of circle of radius 1 B). π is the area of the circle of diameter 1 C). π is the circumference of a circle of radius 1 D). π is the circumference of a circle of diameter 1 E). π is the constant of proportionality relating the diameter of a circle to its circumference F). π is the constant of proportionality relating the radius of a circle to its area