What is required when using a stepladder?

When using a stepladder, it is essential to fully open it and lock the braces to ensure maximum stability and safety. Properly opening the ladder provides a solid structure that can support the user’s weight while they are working at height. Locking the braces prevents accidental folding or collapsing, which could lead to falls or injuries. It's a fundamental safety practice that helps maintain the integrity of the ladder during use, allowing for safe access to elevated areas.

The other choices may relate to ladder usage, but they do not meet the critical safety requirements. For example, closing the ladder after use is a good practice but does not pertain to the necessary precautions while actively using the ladder. Keeping the ladder on a sloped surface is unsafe and increases the risk of tipping over. Using a paint platform is applicable in specific scenarios but is not a requirement for general ladder operation and does not address the foundational safety needs when using a stepladder. Thus, properly opening and securing the ladder is paramount for safe usage.