There are many different types and configurations of switches, including all of the following EXCEPT: a. Toggle switches. b. Push-button switches. c. Specialty switches. d. Friction switches.

The correct answer is d. Friction switches.<br /><br />Explanation:<br />- Toggle switches, push-button switches, and specialty switches are all common types of switches used in various applications.<br />- Friction switches, however, are not a recognized type of switch in the context of electrical or electronic switches.