Which is true about the 4 to 1 rule in ladder safety?

The 4 to 1 rule in ladder safety pertains specifically to the relationship between the height of the ladder and the distance from the base of the ladder to the wall or surface it is leaning against. This rule states that for every 4 feet of ladder height, the base should be 1 foot away from the wall. This guideline ensures the ladder maintains a safer angle, which reduces the risk of the ladder tipping over while in use. By following this rule, users can significantly enhance their safety while working at heights, thus preventing accidents related to improper ladder placement.

The other options do not accurately reflect the principles of ladder safety within this context. Securing the ladder, for example, is indeed a safety measure that can enhance stability but is not a defining feature of the 4 to 1 rule itself. The rule is also not optional; it is a recommended practice for ensuring safe ladder usage. Moreover, the rule applies to extension ladders and straight ladders, not exclusively to step ladders, making the original choice about its relation to ladder height the most accurate.