Recommend a storage solution for a mission-critical application that requires an SLA covering write-operation latency and write throughput. Which service should you include in the recommendation?

Azure Cosmos DB is the correct choice because it is a globally distributed, multi-model database service that offers guaranteed low latency and high throughput with comprehensive SLAs, including those for write operations. This makes it ideal for mission-critical applications requiring predictable performance. Azure Data Lake Storage Gen2 and Azure Blob Storage are object storage solutions primarily designed for large-scale data analytics and general-purpose blob storage, respectively. While they offer high availability, their SLAs typically focus on availability rather than specific write-operation latency and throughput guarantees in the same way a transactional database does. Azure SQL is a relational database service that provides strong consistency and performance, but Cosmos DB's global distribution and specific latency/throughput SLAs for writes make it a superior fit for the stated requirements of a mission-critical application needing guaranteed write performance.