Your company needs to implement a relational database in Azure. The solution must minimize ongoing maintenance. Which Azure service should you use?

SQL Server on Azure Virtual Machines is an Infrastructure as a Service (IaaS) offering, which requires the user to manage the operating system, SQL Server installation, and patching, leading to higher ongoing maintenance.

Azure SQL Database is a fully managed Platform as a Service (PaaS) relational database offering that automates many administrative tasks like patching, backups, and high availability, significantly reducing ongoing maintenance for users.

Azure HDInsight is a managed analytics service for big data processing using open-source frameworks like Hadoop and Spark, not primarily a relational database, and does not fit the requirement.

Azure Cosmos DB is a globally distributed NoSQL database service, not a relational database, and thus does not meet the "relational database" requirement.