A business runs an Amazon RDS database and needs to introduce a caching tier while ensuring the solution remains highly available. Which pair of actions will satisfy both requirements? (Choose two.)

Deploying an Amazon ElastiCache cluster using Redis provides a robust caching solution. Redis supports advanced data structures, persistence, and replication, making it suitable for a wide range of caching needs and offering better high availability features compared to Memcached. Enabling Multi-AZ on the caching data store for failover ensures high availability. This configuration automatically provisions and maintains a standby replica in a different Availability Zone, allowing for automatic failover in case of an outage in the primary AZ, minimizing downtime. Memcached is a simpler caching solution, primarily for object caching, and lacks the advanced features and robust high availability options of Redis. Auto Discovery is a feature that can be added but doesn't inherently provide high availability for the caching layer itself. Multi-threading improves throughput but does not directly address high availability or failover capabilities.