What is the safe method for using enter in an engine?

A closed dispensing system is considered the safest method for using enter in an engine because it minimizes the risk of spills and exposure to harmful substances. In a closed system, the fuel or fluid is contained and delivered directly from a sealed source to the engine without coming into contact with the environment, reducing the chance of accidents and emissions. This method also helps in preventing contamination and ensuring that the material being dispensed is handled safely and efficiently.

The other options do not provide the same level of safety. An open dispensing system can expose workers and the environment to hazardous materials, while manual pouring lacks the control and precision of a closed system, increasing the likelihood of spills. Using a funnel, while potentially helpful, may still pose a risk if it is not part of a closed system, as it does not fully contain the material being poured.