The center of a circle is at the origin on a coordinate grid. The vertex of a parabola that opens upward is at (0,9). If the circle intersects the parabola at the parabola's vertex, which statement must be true?
A. The maximum number of solutions is one
B. The maximum solutions is three
C. The circle has a radius equal to 3
D. That circle as a radius less than 9
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