When provisioning an Azure Cosmos DB account, which feature provides redundancy within an Azure region? 

Answer options:

A. multi-master replication
B. Availability Zones
C. the strong consistency level
D. automatic failover

B

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. Note: Azure Cosmos DB provides high availability in two primary ways. First, Azure Cosmos DB replicates data across regions configured within a Cosmos account. Second, Azure Cosmos DB maintains 4 replicas of data within a region. Reference: https://docs.microsoft.com/en-us/azure/cosmos-db/high-availability