Which option is NOT one of the three common delivery formats for spoken messages?

A lecture is indeed a common delivery format for spoken messages; however, in the context of identifying an option that is NOT one of the three common delivery formats, it's essential to consider the nature of each format.

Lectures are typically one-way communications where an instructor or speaker conveys information to an audience without expecting interaction. Presentations and dialogues involve more interaction, with presentations often incorporating visuals and dialogues being a form of discussion or conversation between two or more parties.

While a debate can occur in a structured format that allows two opposing sides to present their arguments, it is not typically classified in the same way as the basic spoken message formats like lectures, dialogues, and presentations, which emphasize clarity and audience comprehension. Hence, the original answer identifies lecture as an incorrect response regarding common delivery formats for spoken messages, as it doesn't fit the expected interactive nature of the other formats listed.