The circle below is centered at the point (1, 2) and has a radius of length 3.
What is its equation?
O A. (x-2)2 + (y- 1)2 = 32
O B. (x-2)2 + (y + 1)2 = 9
O c. (x-1)2 + (x + 2)2 = 9
O D. (x-1)2 + (x - 2)2 = 32