Final answer:
A scaffold with platforms supported by rigid structures like outrigger beams, legs, or poles is known as a supported scaffold, which is the correct answer to the question.
Step-by-step explanation:
A supported scaffold has one or more platforms supported by outrigger beams, brackets, poles, legs, uprights, posts, frames, or similar rigid support. When comparing the options provided, a mobile scaffold typically refers to a portable scaffolding with wheels, a suspended scaffold hangs from ropes or other non-rigid, overhead support, and an adjustable scaffold has a platform that can be moved to different levels manually or by mechanical means. Therefore, the correct option is Option 1. Supported.