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You plan to deploy several Azure virtual machines.
You need to ensure that the services running on the virtual machines are available if a single data center fails.
Solution: You deploy the virtual machines to two or more scale sets.
Does this meet the goal?
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A. B.B
This answer does not specify that the scale set will be configured across multiple data centers so this solution does not meet the goal.
Azure virtual machine scale sets let you create and manage a group of load balanced VMs. The number of VM instances can automatically increase or decrease in response to demand or a defined schedule. Scale sets provide high availability to your applications, and allow you to centrally manage, configure, and update many VMs.
Virtual machines in a scale set can be deployed across multiple update domains and fault domains to maximize availability and resilience to outages due to data center outages, and planned or unplanned maintenance events.
https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/availabilityThe solution presented in the question is one possible way to achieve the stated goal of ensuring that the services running on the virtual machines are available if a single data center fails.
A virtual machine scale set is a way to deploy and manage a set of identical virtual machines. When you deploy a virtual machine scale set across multiple data centers or Availability Zones, the virtual machines are distributed across those locations, which helps to ensure that if one location fails, the other locations can continue to provide service.
Therefore, deploying virtual machines to two or more scale sets can be an effective way to ensure that the services running on the virtual machines remain available in the event of a single data center failure.
As such, the answer to the question is "Yes".