Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to clean the heating element in a grill [title] Disconnect your fuel. [step] Make sure your propane or other gas supply is completely turned off before you begin. You may even choose to disconnect the gas tank after turning off the fuel for extra safety.

Ending1: Do not attempt to clean your grill while gas is connected or while it is still hot. [substeps] This not only means making sure that your grill is off, but that you turn the valve on your gas tank to cut off the flow of gas to the grill. Ending2: [substeps] You will want to shut off your gas tank immediately so you don't waste any of the gas. There are special propane ranges, but you can set your grill to either electric or gas. Ending3: Some people also prefer to disconnect the fuel line to avoid fume contamination. [substeps] You do not need to disconnect the fuel line while working on the grill. Ending4: [substeps] Make sure your fuel is on a hot source. Some sources could require you to cut fuel into small bits.

Answer format: ending1/ending2/ending3/ending4