Basic Concept: This question tests choosing the correct Azure migration approach by matching the source platform, target service, downtime tolerance, and administrative effort.
Why B is Correct: Elastic pools let multiple Azure SQL databases share a fixed pool of resources, which is cost-effective when individual database usage is variable and unpredictable. In this scenario, the important constraint is: You have five on-premises servers that have Microsoft SQL Server 2022 Enterprise installed Each server contains multiple database that store data for web apps and are backed up by using a third-party backup solution. in Azure SQL Database elastic pool satisfies that constraint without adding an unrelated service or manual process.
Why A is Wrong: SQL Server on Azure Virtual Machines is an Azure data-platform feature, but it must match the workload model, service tier, migration path, or deployment constraint described in the scenario. It would solve a neighboring problem, but not the deployment, sizing, or migration requirement in this item.
Why C is Wrong: Azure SQL Database is an Azure data-platform feature, but it must match the workload model, service tier, migration path, or deployment constraint described in the scenario. It applies to a different Azure data-platform design than the one the question is testing.
Why D is Wrong: Azure SQL Managed Instance is an Azure data-platform feature, but it must match the workload model, service tier, migration path, or deployment constraint described in the scenario. It would solve a neighboring problem, but not the deployment, sizing, or migration requirement in this item.