What function does the Relativity Short Message Viewer serve?

The Relativity Short Message Viewer is specifically designed to display SMS and instant messages, along with any attachments that may be included within those messages. This functionality is crucial for legal investigations where understanding the context and content of communication can be vital. By presenting both the text of the messages and any associated files, the Short Message Viewer facilitates a comprehensive review of the communication records, allowing users to gather insights that might be pivotal for case analysis.

In the context of the other options, none provide the same breadth of data relevant to communications as the Short Message Viewer does. Static images do not convey the dynamic nature of conversations, accessing email-only communications limits the scope entirely, and live video chats fall outside the viewer's functionality. Hence, the capability to handle both SMS and instant messages, including their attachments, makes this option the most effective and correct representation of the viewer's purpose.