3. The points (2, 4, 5), (4, 5, 3), and (1, 1, 6) are three of four vertices of parallelogram ABCD. Explain why there are three possibilities for the location of the fourth vertex and find the three points. (4 marks) 4. The points A(2, 1, z), B(2, 4, 3), and C(10. y, 1) are collinear. Find the values of y and z. (2 marks)