CDB1 hosts a container that stores continuously updated operational data. You need to analyze that operational data daily with AS1 without degrading the performance of the operational data store. Which solution should you include in the design?

Azure Synapse Link for Azure Cosmos DB is the correct solution because it enables near real-time analytics over operational data in Azure Cosmos DB without impacting the performance of the transactional workload. It achieves this by using a separate analytical store, which is optimized for large-scale analytics queries in Azure Synapse Analytics. Azure Data Factory with Azure Cosmos DB and Azure Synapse Analytics connectors would involve periodic data movement, which could be complex to manage and might not meet the "without degrading performance" requirement during extraction. Azure Synapse Analytics using PolyBase is primarily for SQL Server data warehouses and not directly optimized for continuous operational data from Cosmos DB. The Azure Cosmos DB change feed provides a stream of changes but requires custom processing to build an analytical store, which is less efficient than Synapse Link's integrated solution.