Which display systems show images projected from a computer and allow instructors to display documents for group discussions?

The correct choice highlights multimedia projectors as the ideal display systems for showing images projected from a computer and facilitating group discussions. Multimedia projectors connect to computers, allowing instructors to present a variety of content, including slideshows, documents, videos, and other visual aids in a large format that everyone in the room can see. This makes them highly effective for engaging participants and enhancing understanding during discussions.

Multimedia projectors are specifically designed to support diverse media formats, thus expanding the interactive capabilities of a classroom while enabling easy visibility and engagement from all audience members. In contrast, the other options do not fulfill the requirement of projecting images from a computer. Marker boards serve as a surface for writing or drawing, audio recordings focus solely on sound without visual components, and duplicated materials refer to printed documents rather than projection, limiting their use in dynamic presentations.