Introduction to Three Dimensional Geometry

Let A(x, y, z) be a point in xy-plane, which is equidistant from three points (0, 3, 2), (2, 0, 3) and (0, 0, 1). Let B = (1, 4, -1) and C = (2, 0, -2). Then among the statements (S1) : ABC is an isosceles right angled triangle, and (S2) : the area of ABC is 9 22,

1. both are false
2. only (S2) is true
3. only (S1) is true
4. both are true