The center of a circle is at (−3, 1) and its radius is 9. What is the equation of the circle?
A.) (x+3)2+(y−1)2=81
B.) (x−3)2+(y+1)2=18
C.) (x−3)2+(y+1)2=81
D.) (x+3)2+(y−1)2=18

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