You have a DynamoDB table and must replicate it to another AWS Region for disaster recovery. What action should you take to enable cross-Region replication of this table?

To enable cross-Region replication for disaster recovery with DynamoDB, you must configure the table as a global table. This involves enabling DynamoDB Streams on the source table, which captures all data modifications. Then, you add the desired target Region to the global table configuration. DynamoDB automatically replicates data changes between the specified Regions, ensuring high availability and disaster recovery. Enabling DynamoDB Accelerator (DAX) is for caching and improving read performance, not for cross-Region replication. Turning on DynamoDB Streams and adding a global secondary index (GSI) is insufficient; while Streams are a prerequisite for global tables, a GSI is for query optimization within a table, not replication. Enabling point-in-time recovery (PITR) provides continuous backups within the same Region, allowing restoration to any point in time within a 35-day window, but it does not replicate data across Regions.