The main purpose of an Information System Level labeled as 'Work Group' is to:

The primary function of an Information System Level known as 'Work Group' is to facilitate communication and collaboration among a collection of users within a specific team or department, often referred to as a work group. This level of an information system is tailored to support the unique needs and workflows of small groups of users, enabling them to share information more effectively and coordinate their tasks.

By creating a network of interconnected computers, a work group information system enhances collaboration through shared resources, applications, and data. This interoperability allows team members to work together seamlessly, regardless of their physical location, fostering productivity and efficiency. For instance, in a project team, members can access shared documents, communicate in real time, and manage tasks collectively, all within a defined group setting.

The other options do not align as closely with the core attributes of a work group information system. Connecting individual users to external networks pertains more to general networking functions rather than specific work group collaboration. Uniting all information from the organization into one system suggests a broader enterprise-level information system, while maintaining data privacy focuses on security measures rather than the collective collaboration enabled by a work group.