The statements about point C and point D that are true are seen in option D and option E.
What is the distance postulate and ruler placement postulate?
In Euclidean geometry, the distance postulate explains the concept of distance between two point in a line on a geometry plane. It also emphasize on the notion that there is a relative positive value called the distance in between two points on the plane.
Therefore, from the graph, the true statement is that "the distance postulate says that there is a positive number called the distance between points C and D.
The ruler placement postulate explains the measurement of a line segment. Suppose we have a line segment AB which an point C in between the line segment. Then AC + CB = AB.
Thus, from the graph, either C or D can be set to zero provided the result value is positive.