An application owner at your organization requests a solution for zero RTO In the event...

The NetApp solution that fulfills the requirements is SnapMirror Business Continuity (SM-BC). SM-BC is a business continuity solution for zero RPO and near zero RTO that was introduced in ONTAP 9.8. SM-BC enables transparent application failover and failback between two ONTAP clusters without requiring any application reconfiguration. SM-BC supports ISCSI LUNs as well as NFS and SMB file shares. The other options are not suitable for this scenario because:

SyncMirror is a local high availability solution that mirrors data within a single HA pair, not across clusters.

SVM DR is a disaster recovery solution that replicates data and configuration of an SVM to another cluster, but requires manual intervention to activate the destination SVM and reconfigure the application.

SMS is a synchronous replication solution that provides zero RPO, but not zero RTO, as it also requires manual intervention to activate the destination volume and reconfigure the application. References :- SnapMirror Business Continuity overview, SnapMirror Business Continuity for ONTAP 9.12, SnapMirror Business Continuity FAQ