What is the minimum number of IP addresses required for the node and cluster roles on Cluster3?

Two IP addresses would only cover the two nodes, leaving no IP for the cluster name object (CNO), which is essential for the cluster's network identity.

A Windows Server Failover Cluster requires at least one IP address for each node in the cluster. Additionally, the cluster core resource (Cluster Name Object - CNO) itself requires its own IP address to be reachable on the network. Therefore, for a two-node cluster, you would need two IPs for the nodes plus one for the cluster object, totaling three IP addresses.

Four IP addresses are more than the minimum required; while possible for additional cluster roles or specific configurations, it's not the minimum.

Five IP addresses are also more than the minimum required.