If you answered cautious children, grade yourself a 1. If you answered rambunctious children, grade yourself a 2.
Reason: If you know your children are calm well behaved and generally cautious consider yourself blessed. You probably are not going to have a problem with a 4-foot-tall fence. If your children aren’t little angels and you’re worried about them because they throw caution to the wind and can climb almost anything, then you know that regardless of anything else you should put up a fence higher than 4 feet.