Enabling redundancy across availability zones makes Azure Cosmos DB resilient to zone outages at the cost of increased charges.
https://learn.microsoft.com/en-us/azure/cosmos-db/high-availability#replica-outages
With Availability Zone (AZ) support, Azure Cosmos DB will ensure replicas are placed across multiple zones within a given REGION to provide high availability and resiliency to zonal failures. Availability Zones provide a 99.995% availability SLA with no changes to latency. In the event of a single zone failure, zone redundancy provides full data durability with RPO=0 and availability with RTO=0.
D righ answer
It is strongly recommended that you configure the Azure Cosmos accounts used for production workloads to enable automatic failover. This enables Cosmos DB to failover the account databases to availabile regions automatically. In the absence of this configuration, the account will experience loss of write availability for all the duration of the write region outage, as manual failover will not succeed due to lack of region connectivity.
https://docs.microsoft.com/en-us/azure/cosmos-db/high-availability
The question states "... within an Azure region". The feature use describe operated across different regions NOT within the the same region, so D is wrong.
B is the correct answer. The question is providing redundancy within a region and not across regions.
upvoted 3 times
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