Refer to the exhibit. An engineer is analyzing a Network Risk Report from Cisco FMC. Which application must the engineer take immediate action against to prevent unauthorized network use?

Kerberos is a legitimate and widely used network authentication protocol essential for securing many enterprise services, and blocking it would severely disrupt authorized network operations.

YouTube is a legitimate video-sharing platform, and while it might be blocked for productivity reasons, it does not inherently represent "unauthorized network use" or a security threat in the same way as an anonymity network.

Chrome is a standard web browser, a fundamental tool for network access. Blocking it would prevent all legitimate web-based network use, not just unauthorized activity.

TOR (The Onion Router) is an anonymity network commonly used to bypass security controls, obscure user identity, and access potentially illicit content, thus representing a significant risk for unauthorized network use in an enterprise environment. Its presence warrants immediate investigation and action to prevent data exfiltration or policy violations.