Which statement about flow diagrams is true?

• A. Flow diagrams use only rectangles
• B. Flow diagrams always use only 4 shapes
• C. Flow diagrams commonly use rectangles for processes and diamonds for decisions
• D. Flow diagrams are not used in robotics

Answer: (C)

Flow diagrams use a standard set of shapes to represent different kinds of steps. The most common convention is to use rectangles for processing steps and diamonds for decision points, which makes it easy to follow the control flow and see where branching occurs. There are other shapes for start/end, input/output, and connectors, so it isn’t limited to a single shape or a fixed four-shape set. Also, flow diagrams are widely used in robotics to map control logic, decisions, and sequences, so saying they aren’t used there isn’t accurate. This combination of distinct shapes for process and decision is what makes that statement true.