Which of the following is NOT a component of the warning sign described?

• A. Warning
• B. Dangerous cargo
• C. No visitors
• D. Keep doors closed

Answer: (D)

Warning signs in hazardous areas are designed to communicate danger quickly and restrict access. A typical sign includes the word Warning to grab attention, an explicit statement about the hazard such as Dangerous cargo to identify what is risky, and a prohibition or restriction like No visitors to keep unauthorized personnel out. The instruction Keep doors closed is not part of the standard warning sign’s message; it’s a separate safety practice or procedural guideline rather than a feature of the sign itself. So Keep doors closed isn’t a component described on the warning sign.