A cybersecurity analyst has identified an ongoing attack on a virtualized server environment. While the analyst has implemented network segmentation, they must now decide the most effective isolation step to preserve evidence and maintain operations. The environment includes a mix of live client services and development systems. Which of the following actions should the analyst take FIRST?
Immediately perform forensic imaging of the affected virtual machines
Suspend the affected virtual machines, preserving their operation states
Update firewall rules to restrict traffic to and from the virtual machines' current IP addresses
Reconfigure the virtual network interfaces to an isolated VLAN