A Redis OSS replication group stores disposable session cache data. It currently has a primary and a replica in the same Availability Zone. Operations needs managed failover if that Availability Zone fails. Which configuration is the best fit?

1. Replace the replication group with two unrelated writable primaries and use DNS round robin.
2. Keep both nodes in one zone and enable daily snapshots only.
3. Place a replica in a different Availability Zone and enable Multi-AZ with automatic failover.
4. Disable replication and increase the primary node memory capacity.