For Problems 1-4, find a parameterization of the curve or portion of a curve described. 1. The line segment starting at (1, 4, -1) and ending at (1, 3, 2). 2. The circle of radius 4 in the plane a = 3, centered at the point (3, 0, 0). 3. The circle of radius 2 in the plane z =5 centered at (0, 0,5) and oriented counterclockwise as seen from above. 4. The curve x = y in the ry-plane, starting at (16, -2) and ending at (1, 1)