Step 1: Understanding hazard communication.
In workplaces that handle chemicals or hazardous materials, safety communication is very important. Signs and symbols are used to warn workers and emergency personnel about the presence of dangerous substances so that proper precautions can be taken.
Step 2: Purpose of warning signs.
Warning signs are used to indicate potential hazards and alert individuals about dangerous conditions, including hazardous chemicals. These signs help employees identify risks and take appropriate safety measures before entering a hazardous area.
Step 3: Analysis of the options.
- (A) Poison signs: These indicate toxic substances but are not the general category used to alert personnel about hazardous chemical areas.
- (B) Corrosive signs: These specifically indicate substances that can damage materials or tissues but do not represent all hazardous chemicals.
- (C) Warning signs: Correct. These signs alert employees and emergency personnel to potential hazards, including hazardous chemicals.
- (D) Oxidiser signs: These indicate substances that can cause or intensify fire but are specific rather than general hazard indicators.
Step 4: Conclusion.
Therefore, warning signs are used to alert employees and emergency personnel to the presence of hazardous chemicals.
Final Answer:} Warning signs.