Which valve protection option specifically indicates protection with vent holes?

• A. Valves inside neck with threaded plug
• B. Valves protected by shrouds or guards
• C. Valves protected by caps with vent holes
• D. No valves used

Answer: (C)

The thing this question tests is how a valve protection option communicates venting capability. When a cap includes vent holes, it protects the valve from damage while still allowing gas to vent if pressure builds, which is exactly what “protection with vent holes” means. That’s why the option describing valves protected by caps with vent holes is the best choice. The other protections describe shielding or enclosing without any venting, or using no valves at all, so they don’t indicate vent hole protection.