Which of the following is the equation for a circle with a center of (−2, 3) and a radius of 9?
(x + 2)2 + (y − 3)2 = 9
(x − 2)2 + (y + 3)2 = 81
(x + 2)2 + (y − 3)2 = 81
(x − 2)2 + (y + 3)2 = 9