Which of the following is a valid feature of the Sentinel system?

The Sentinel system is designed with advanced capabilities that include real-time data processing. This feature is crucial for air defense operations, as it allows for immediate analysis and response to incoming threats. By processing data in real time, the Sentinel system can track multiple targets and provide situational awareness to users effectively, enabling them to make informed decisions quickly.

In contrast, the other options do not accurately reflect the capabilities of the Sentinel system. The system supports multi-user access, allowing various operators to utilize the data efficiently. Additionally, the capability for manual tracking only would limit its effectiveness in quickly identifying and responding to threats, which is not the case with the Sentinel system that relies on automated processes. Furthermore, a non-networked operation would hinder its effectiveness in a modern combat environment where communication and data sharing are essential, making this option inconsistent with the operational design of the Sentinel system.