The correct answer is Azure Cosmos DB.

Azure Cosmos DB is a globally distributed, multi model database that is built for single digit millisecond latency and very high throughput. It provides turnkey global distribution and elastic provisioned throughput so it can serve users around the world with low latency while supporting simple key value access patterns.

Azure Cache for Redis provides extremely low latency and high throughput in memory, but it is primarily a caching solution and not intended to be the durable, globally distributed primary store for user data. Using it as a primary store risks data loss and it does not provide the same built in global distribution features.

Azure Blob Storage is object storage optimized for large unstructured data and throughput at scale, but it is not designed for single digit millisecond key value lookups and interactive low latency access patterns.

Azure Data Lake Storage is intended for big data analytics and batch processing and it is not suitable for low latency key value operations for globally distributed interactive users.

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