What is the equation in standard form of the circle represented by x2 + y2 - 10x - 6y = 23? A. (x + 5)2 + (y + 3)2 = 23 B. (x + 5)2 + (y + 3)2 = 57 C. (x - 5)2 + (y - 3)2 = 23 D. (x - 5)2 + (y - 3)2 = 57