Draw a line PQ. Draw another line parallel to PQ at a distance 3 cm from it

Which of the following diagrams are correct?

The steps of constructing a Line CD parallel to PQ at a distance of 3 cm.

1. Draw a line PQ.
2. Take any two points and mark them as A and B on the line
3. Using a compass, we construct $\angle \mathrm{PBF}={90}^{\mathrm{o}} \mathrm{and} \angle \mathrm{QAE}={90}^{\mathrm{o}}$
4.  With A as center, we draw a circle of radius 3 cm and cut AE at point C
5. Similarly, with B as the center and radius of 3 cm cut BF at D
6. Join the CD and produce it on either side to get the required line parallel to AB and at a distance of 3cm.