When provisioning an Azure Cosmos DB account, which feature provides (DP-900)

Correct answer: B. Availability Zones.
Availability Zones (AZs) provide redundancy within an Azure region by distributing resources across multiple physical locations within the region. This ensures that if one location becomes unavailable, the resources in the other locations can continue to operate, providing high availability and redundancy.

The other options are not correct because:
A) Multi-master replication provides redundancy across multiple regions, not within a single region. It allows multiple regions to act as primary write regions, which can help with disaster recovery and high availability across regions.
C) The strong consistency level is a consistency model that ensures that all reads are guaranteed to see the most recent write, but it does not provide redundancy within a region.
D) Automatic failover is a feature that allows Azure Cosmos DB to automatically switch to a secondary region in the event of a failure, but it does not provide redundancy within a single region.