Find the equation of the sphere through the points (2, 0, 1) (1, -5, -1), (0, -2, 3) and (4, -1, 2)
1
x2 + y2 + z2 - 4x - 6y - 2z + 5 = 0
2
x2 + y2 + z2 - 4x + 6y - 2z - 5 = 0
3
x2 + y2 + z2 - 4x + 6y - 2z + 5 = 0
4
x2 + y2 - z2 - 4x + 6y - 2z + 5 = 0