Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean a beer keg [title] Depressurize the keg before cleaning. [step] A keg will have to be completely depressurized before it is disassembled, otherwise you risk damaging the keg and hurting yourself. Leave the tap open and let any remaining liquid and pressurized air escape before trying to remove the lid.

Ending1: [title] Clean and sanitize the keg beneath the controls. [step] Check that the controls are (c), aac (up), lt (down), rb and rrn. Ending2: [substeps] Shutting the water supply to the keg while it is fully assembled might cause it to overheat if it is damaged. [title] Empty the keg once unpressurized. Ending3: [substeps] Once the hissing sound caused by escaping pressurized air has stopped, the keg will be completely depressurized. [title] Remove the keg's lid and the sealing o ring. Ending4: [substeps] Before removing any lid, make sure the temperature in the keg hasn't dropped below 50 ° f (4 ° c). You will want to pour the beer from a cooler inside the keg to help it depressurize faster.

Answer format: ending1/ending2/ending3/ending4