You are designing a SQL database solution. The solution will include 20 databases that will be 20 GB each and have varying usage patterns.

You need to recommend a database platform to host the databases. The solution must meet the following requirements:

• The solution must meet a Service Level Agreement (SLA) of 99.99% uptime.
• The compute resources allocated to the databases must scale dynamically.
• The solution must have reserved capacity.
• Compute charges must be minimized.

What should you include in the recommendation?

A. an elastic pool that contains 20 Azure SQL databases

B. 20 databases on a Microsoft SQL server that runs on an Azure virtual machine in an availability set

C. 20 databases on a Microsoft SQL server that runs on an Azure virtual machine

D. 20 instances of Azure SQL Database serverless

Explanation:
The compute and storage redundancy is built in for business critical databases and elastic pools, with a SLA of 99.99%.

Reserved capacity provides you with the flexibility to temporarily move your hot databases in and out of elastic pools (within the same region and performance tier) as part of your normal operations without losing the reserved capacity benefit.

Reference:
https://azure.microsoft.com/en-us/blog/understanding-and-leveraging-azure-sql-database-sla/