Final answer:
QR codes are not considered part of an audio or visual notification device; they are used for storing information and are not designed to alert individuals.
Step-by-step explanation:
The option that is NOT considered part of an audio or visual notification device is D) QR codes. Audio and visual notification devices are designed to alert or notify individuals about a situation. Devices such as strobe lights (A) visually signal an individual, sirens (B) use sound to catch attention, and vibrating devices (C) provide haptic feedback. QR codes, on the other hand, are typically used for storing information for a reader to scan and do not serve as an alert or notification.