solve c,d only asap

3. (a) (20 points) Find the equation for a ruled surface created from two rails G and Q, where G is the line created from endpoints Po = (1, 0, 1) and Pi = (2, 2, 0), and Q is the Bezier curve created from control points P2 = (3, 4, 2), P3 = (4, 5, 2), and P4 = (6, 5, 4). (b) (10 points) What are the two unit tangent vectors at the point P2 = (3, 4, 2)? (c) (10 points) What is the unit normal vector at the point P2 = (3, 4, 2)? (d) (10 points) What is the twist vector at the point P2 = (3, 4, 2)