What is the equation of a circle with center (8,6) and radius 5?
O A. (x-8)2 + (y- 6)2 = 25
O B. (x+8)2 + (y + 6)2 = 5
O C. (x+8)2 + (y+ 6)2 = 25
O D. (-8)2 + (-6)2 = 5