Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to light a water heater [title] Check the pilot light. [step] You will probably need to remove a small panel, called an access panel, at the bottom of the tank in order to see whether the pilot light is actually out. If you do not see a small flame burning, then your pilot light has gone out.

Ending1: [substeps] If you can't see small red sparks coming from the pilot light at the bottom of the tank, then your pilot light is likely either being burnt or not lit. [title] Open the tank's set of panels. Ending2: [substeps] If you have a newer water heater, it is possible that your panel is not removable and that you view your pilot light through glass. In this case, if you cannot see a flame burning through the glass, then your pilot light is out. Ending3: If there is a large, small flame burning through the bottom window, however, then your pilot light is probably out. [title] Find the factory-rated pilot light and oil tank units. Ending4: [substeps] Make sure that the shutoff valve will turn off. If it does not, then you have to replace it.

Answer format: ending1/ending2/ending3/ending4