Which of the following motors are allowed in the competition?

In the context of the FTC competition, only motors that are designated as "FIRST-legal" are permitted for use. This regulation ensures that all teams compete on a level playing field and adhere to established safety and performance standards set by FIRST. FIRST-legal motors have undergone scrutiny and testing to ensure they meet specific criteria for functionality and reliability, which helps maintain fairness in the competition.

This restriction does not allow for any commercially available motors unless they fall under the FIRST-legal category, as this could lead to significant advantages based on the motor types selected. Additionally, limits are placed on motor specifications to prevent excessive power or capabilities that could disrupt the competitive balance. This fosters an environment where creativity and engineering skills are essential, rather than simply relying on advanced motor technology.

The other options suggest a broader range of motor usage without the necessary safety and fairness checks, which would undermine the spirit of equitable competition.