What type of equipment is designed to convey information or attract attention using electrically illuminated components?

The correct choice is an electric sign. Electric signs are specifically designed to convey information or attract attention through the use of electrically illuminated components. This includes a variety of formats such as neon lights, LED displays, and other lighting technologies that provide visibility and draw the eye, especially in low-light conditions.

Electric signs are widely used in commercial settings, street displays, and advertising to ensure that messages are easily noticeable and can effectively communicate to the public. The primary function of these signs is to utilize illumination not just for aesthetic appeal but also for clarity in conveying specific messages or information.

Other options, while they may include some form of illumination, do not focus solely on the primary purpose of conveying information through electric light. For example, safety signs generally serve more of a precautionary role and might not be designed specifically with bright, attention-attracting illumination in mind. Similarly, illuminated banners and highway signs may incorporate electric components for visibility, but their main designs prioritize different functions, such as advertising or traffic guidance, which may not involve continuous or conspicuous illumination.