Which of the following are among the five basic postulates of Euclidean geometry?
1) The existence of a unique line through any two points.
2) The existence of a unique circle with any given center and radius.
3) The existence of a unique line perpendicular to a given line through a given point not on the line.
4) The existence of a unique line parallel to a given line through a given point not on the line.
5) The existence of a unique line segment connecting any two points.