Pick up the incorrect statement from the following:
A. An activity of a project is denoted by an arrow on the net work
B. The tail of the arrow indicates the start of the activity
C. The head of the arrow indicates the end of the activity
D. The arrows are drawn to scale from left to right
Answer: Option D

An Activity is represented by "arrow" in network diagram and in critical path method,which shows the direction of the activity and its dependencies.Whereas an Activity is represented by a "Node (or circle or box) in program evaluation and review technique (PERT) chart which contains information about the activity, such as its name, duration, and dependencies.