What includes any printed matter distributed by instructors during a class?

Handouts are materials prepared by instructors for distribution to students during a class. They serve various purposes, such as providing additional information, summarizing key concepts, or offering reference material that complements the instructional session. This printed material can include anything from worksheets and guides to informational pamphlets and slides, all tailored to enhance the learning experience.

In contrast, models are three-dimensional representations used to illustrate specific concepts, while training props are items used in demonstrations or exercises to aid in practical learning. Projected teaching aids typically involve visual presentations displayed through equipment like projectors and screens but do not include printed materials. Thus, handouts uniquely encompass all forms of printed matter distributed during a class, making them the correct answer.