Which type of support might be used on a rooftop?

The use of a step ladder on a rooftop is appropriate for providing the necessary access and support when working at heights. Step ladders are designed to be stable on various surfaces and can be easily positioned near the edge of a rooftop, allowing workers to safely reach the necessary areas for maintenance or installation tasks.

The design of a step ladder, with its wide base and locking mechanisms, ensures that it remains stable while in use, making it a reliable choice for tasks that require elevation. This allows carpenters and builders to perform work safely, reduce the risk of falling, and maintain their tools and materials close at hand while on the roof.

Other options, like a sawhorse, are primarily used for holding material at a specific height and do not provide direct access to elevated areas. A bracket is typically used as a support for shelves or similar items rather than for climbing. A trestle, while useful in some construction contexts, is more commonly used in conjunction with planks for creating temporary work platforms, rather than direct access to rooftops.