Microsoft Azure Fundamentals AZ-900 Practice Exam 2025 – Complete Study Resource

The chosen answer correctly identifies SQL Database as a service that is classified as Database as a Service (DaaS) and is based on Microsoft SQL Server. SQL Database is a relational database service provided by Azure that uses the SQL Server engine, enabling users to run their applications without having to manage the underlying infrastructure. This means that tasks such as backup, replication, and scaling are handled by Azure, allowing businesses to focus on their applications instead of database maintenance.

In comparison, BLOB Storage is designed for storing large amounts of unstructured data, such as images or video files, and is not a database service. Data Lake is meant for big data analytics and is primarily used for storing large volumes of structured and unstructured data in its native format, rather than for managing relational data through a database system. Cosmos DB, while a highly scalable and versatile Database as a Service, is a NoSQL database and is not based on SQL Server but rather supports multiple data models.

Thus, SQL Database stands out as the correct choice because it directly relates to the SQL Server architecture and the principles of Database as a Service.