The suggested answer is B, E.
To achieve high availability within the eu-central-1 region and disaster recovery in the eu-west-1 region, it is necessary to configure SAP HANA system replication correctly. For high availability within the same region (eu-central-1), SYNC or SYNCMEM replication mode is appropriate as both can handle less than 1 ms latency effectively. ASYNC replication mode is suitable for disaster recovery across regions (eu-west-1), considering the inter-region latency is greater than 1 ms. Option B sets up the primary system in one availability zone and the secondary system in another within the eu-central-1 region using SYNC replication, and uses ASYNC replication for the DR system in eu-west-1, ensuring both high availability and effective DR. Option E, similarly, uses SYNCMEM mode for the internal region replication and ASYNC for cross-region DR setup. These configurations align perfectly with the prerequisites and requirements.