What describes a "mixed message" in communication?

A "mixed message" in communication occurs when verbal and non-verbal signals conflict, leading to confusion or misunderstanding. In this context, body language that contradicts spoken words signifies a mixed message. For instance, if someone says they are happy while their facial expression displays sadness or disinterest, the contradiction creates a mixed message.

The other options describe different communication scenarios but do not represent mixed messages. Clear and precise words convey straightforward information, changing subjects can indicate a shift in focus rather than a conflict between verbal and non-verbal communication, and a message understood by everyone indicates clarity and unity in communication, which is the opposite of a mixed message.