The most suitable deployment strategy for the described scenario is Active-active with failover clustering. In an active-active setup, all servers are handling traffic concurrently, providing load balancing to distribute the workload evenly and ensure optimal resource utilization. The addition of failover clustering means that these servers are clustered together such that if one fails, the others instantly take over its responsibilities without any noticeable disruption to services. Active-passive with failover clustering implies there's a standby server, which does not provide immediate transition. Round-robin DNS distributes traffic but does not include a mechanism for failover. Active-standby is a less precise term that typically refers to scenarios where secondary resources are not active until a failover occurs. Network multipathing does not address server redundancy but rather the redundancy of network paths. Global Server Load Balancing (GSLB) is utilized for geographically dispersed servers, and while it provides distribution and high availability across sites, it is not specifically focused on instant failover for a single system.