Which of the following is NOT a method of manual communication?

The identification of instant messaging as the method that is not categorized as manual communication is accurate because manual communication specifically refers to methods that involve physical gestures or signs to convey meaning.

Fingerspelling and sign language are both forms of manual communication where hand movements are used to represent letters or whole words, enabling individuals to express themselves without spoken language. Oral communication relies on the use of spoken words and does not fall under the realm of manual methods since it involves verbal interaction rather than physical gestures or signs.

Instant messaging, on the other hand, utilizes text-based digital communication, which does not involve the manual gestures characteristic of fingerspelling or sign language. This differentiates it from the other options, making it the correct response to the question of which method is not a form of manual communication.