As a CISO for a publicly traded company my main concern would be ensuring availability of systems. To mitigate risks and maintain availability, I would implement the following plans. I would implement a disaster recovery plan (DRP), and a business continuity plan (BCP). Any downtime, especially for a publicly traded company, could lead to significant financial losses, legal consequences, and reputational damage. A BCP and DRP, would ensure that systems can be restored quickly after and incident, no matter the incident. Redundancy and failover systems utilization would minimize downtime in case of hardware failure or system overloads, including deployment of redundant systems in multiple availability zones. Regular patching and vulnerability management to avoid software being exploited by hackers to disrupt services. Segmentation of the network to contain any issues within specific parts of the network. As well as continuous monitoring; Active monitoring of system health, performance, and security events helps identify and respond to issues before they lead to downtime or service unavailability.