The circle below is centered at the point (1, 2) and has a radius of length 3.
What is its equation?
O A. (x-1)2 + (y + 2)2 = 9
O B. (x - 2)2 + (1-1)2 = 32
O C. (x - 2)2 + (y + 1)2 = 9
O D. (x-1)2 + (y-2)2 = 32
10