Steps of constructing a line segment equal to the length of given segment is written in jumbled form below:
1. Draw a line l. Mark a point A on line l. Without changing compass's setting, place the compass at A.
2. Make an arc on the line l which cuts l at B. Now, AB is a copy of CD.
3. Draw a line segment CD of any length.
4. Fix the compass's end on C and pencil on D. This gives the length of CD.
Which of the above comes first.