Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to keep kids safe in bounce houses [title] Insist the operator stays on site. [step] Bounce houses generally are operated by workers who have been trained in how to properly operate the bounce house. However, that doesn't always mean the operator stays by the bounce house the entire time.

Ending1: You should insist that the operators remain by the bounce house while the kids are using it. [substeps] The operator should watch what is going on with the kids inside the bounce house. Ending2: To guarantee your safety, insist that the operator stays in time every step of the way. [substeps] The operator should also be familiar with the bounce house system for their job. Ending3: Instead, the operator will take turns doing drills, as well as scanning the bounce house for people. These drills generally involve jumping, jumping off, and hitting and testing the bounce house, making sure everyone gets the shot. Ending4: The operator may choose to stay in their home and even switch to a different one in the future to ensure it's always safe. It may not be an option if you have young children who are likely to fall ill in bounce houses (young kids under the age of two or three, for example).

Answer format: ending1/ending2/ending3/ending4