Which of the following is NOT part of the body of a message?

The body of a message typically consists of the main content that conveys the core information and communicates the intended message to the recipient. Elements like the classification, which helps clarify how the information should be handled, and the footer, which often includes additional informational material or references, are integral to effective communication both in terms of context and compliance with communication protocols.

The subject and class, which summarize the message’s topic and categorize its significance, also belong to the body, as they set the stage for the audience’s understanding of the message's purpose.

In contrast, the date and time group is not a part of the body of the message. Instead, it serves as a metadata element that provides context about when the message was created or sent, often included in the header of a message format, thus separating it from the main content which is contained in the body. This distinction underlines the function of the body as the primary channel for delivering the essential information of the communication.