Which of following for entering the tank, what is not appropriate? D The attendant should be in continuous attendance at the entrance to the tank. C Ventilation must be stoped during the entire period of the operation. C tanks Safety harnesses should be worn at all times when working in C Access openings should be kept open and clear for emergency exit at all times.

The answer is **C. Ventilation must be stopped during the entire period of the operation.**Here's why:* **Ventilation is crucial for safety.** Stopping ventilation in a tank can create hazardous conditions, such as: * **Oxygen depletion:** This can lead to suffocation for workers inside the tank. * **Build-up of flammable or toxic gases:** Many tanks contain substances that release dangerous gases. Ventilation removes these gases. * **Reduced visibility:** Poor ventilation can create fog or haze, making it difficult to see inside the tank.* **The other options are essential safety measures:** * **D. The attendant should be in continuous attendance at the entrance to the tank:** This ensures someone is monitoring the situation and can provide assistance if needed. * **C. Safety harnesses should be worn at all times when working in tanks:** Harnesses provide a secure way to retrieve workers from the tank in case of an emergency. * **C. Access openings should be kept open and clear for emergency exit at all times:** This ensures a quick and safe escape route in case of danger.**Always prioritize safety when working in confined spaces like tanks. Proper ventilation is a critical part of that safety.**