A large industrial system`s smart generator monitors the system status and sends alerts to third-party maintenance personnel when critical failures occur. While reviewing the network logs, the company`s security manager notices the generator`s IP is sending packets to an internal file server`s IP. Which of the following mitigations would be BEST for the security manager to implement while maintaining alerting capabilities? 

Answer options:

A. Segmentation
B. Firewall whitelisting
C. Containment
D. Isolation

B