What type of electronics are permitted for use in the robot?

The correct answer is the choice specifying REV hubs, batteries, and legal sensors/controllers only. In the context of FTC competitions, there are specific regulations regarding the types of electronics that can be included in a robot.

Using REV hubs and approved batteries ensures that the components meet safety and performance standards set by the competition. Additionally, the sensors and controllers that are permitted must comply with the guidelines, which help maintain a level playing field among teams. This restriction aims to ensure fairness, as teams using illegal or unregulated electronics could gain an unfair advantage with performance-enhancing parts, thus undermining the integrity of the competition.

The other choices do not align with the rules as they suggest a level of permissiveness that is typically not allowed in competitive settings. For example, using any commercial electronics, homemade electronics, or unregulated components could lead to safety hazards and technological disparities, which are discouraged in the official FTC framework. This specificity in regulations supports a structured environment for all participants, focusing on innovation within defined limits rather than allowing arbitrary use of technology.