A. Deploy an ElastiCache for Redis cluster with read replicas and Multi-AZ enabled.
B. Deploy an ElastiCache for Memcached global datastore.
C. Deploy a single-node ElastiCache for Redis cluster with automatic backups enabled. In the event of a failure, create a new cluster and restore data from the most recent backup.
D. Use the default maintenance window to apply any required system changes and mandatory updates as soon as they are available.
E. Choose a preferred maintenance window at the time of lowest usage to apply any required changes and mandatory updates.

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