Which of the following is a requirement for a personnel platform's design?

The requirement for a personnel platform's design that is correct states it must be enclosed from toe board to mid rail. This is essential for safety purposes, as the enclosure helps prevent the risk of personnel falling off the platform while working. Having a toe board ensures that tools and materials do not inadvertently roll off the edge, while the mid rail provides an additional level of protection at a height where a person could easily lose their balance or slip.

Additionally, such design specifications are often mandated by safety regulations and standards to ensure that personnel can work safely at heights. An adequately enclosed platform contributes to a safer working environment, reducing the likelihood of accidents and injuries associated with falls.

While some platforms may indeed be made of materials like aluminum or have wheels for mobility, these features are not universally required for every platform design. Adjustable platforms are also beneficial but are not a necessary requirement across all contexts. The critical aspect emphasized here is the safety enclosure from toe board to mid rail.