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