A radius of a circle has endpoints (-4, 3) and (1, -2). what is the equation that defines the circle if it's center is at the second quadrant?
a. (x-1) + (y+2)²= 50
b. (x+1) + (y-2)²= 50
c. (x+4) + (y-3)²=50
d. (x-4)² + (y+3)²=50​