If a customer has a 2-node cluster, which of the following must be enabled for storage failover (SFO) to function properly?

In a 2-node NetApp ONTAP cluster, the `cluster ha modify -configured true` command enables the cluster HA feature, which is a prerequisite and fundamental component for Storage Failover (SFO) to operate correctly. This command ensures the cluster is configured for high availability, allowing for automatic takeover in case of a node failure.

The `cluster modify -node -eligibility true` command relates to a node's eligibility to join a cluster or for specific roles, not directly to enabling SFO.

The `storage failover modify -node enabled true` command enables storage failover for a specific node, but the cluster HA itself must be configured first, making 'A' the more fundamental prerequisite for a 2-node cluster.

The `storage failover modify -node -hwassist true` command enables hardware-assisted failover, which is an enhancement, but not the primary command to enable SFO functionality itself.