If P (-1, 4, -3) is one end of a diameter PQ of the sphere x + y + z - 3x - 2y + 2z - 15 = 0, then the co-ordinates of Q are: 1. (-2, 4, -1) 2. (-4, 2, 1) 3. (4, 2, -1) 4. (4, -2, 1)