Consider the following statements with respects to flow diagram in work study :
1. Movement of machines is drawn in flow diagram
2. Movement of men is drawn in flow diagram
3. In flow diagram, all movements are drawn true to scale.
Which of the above statements are correct?
(a) 1 and 2 only (b) 1 and 3 only
(c) 2 and 3 only (d) 1, 2 and 3