You have an AVD (Azure Virtual Desktop) deployment. You plan to create a host pool with the following requirements: Pooled VMs for approximate 10 users
Will run MS office 365 apps
Will require meetings and calling feature in Microsoft Teams
Must support premium storage
Which virtual machine size would you prefer for the host pool (the solution must minimize the overall cost)?

Answer options:

A.AV2– series
B.Dsv4-series
C.NVv3-series
D.NDv2-series

Correct Answer: B 
The Dv4-series sizes provide a combination of vCPU, remote storage, and memory options for most production workloads. These VMs feature Intel® Hyper-Threading Technology. 
It is recommended to use the Dsv4 sizes for premium storage disks. Dsv4 also supports Live migration. Also, it is the most affordable solution to fulfill all the given requirements.
Option A is incorrect. AV2– series does not support premium storage.
Option B is correct. The Dv4-series sizes provide a combination of vCPU, remote storage, and memory options for most production workloads. Dsv4 series sizes are the most cost-efficient option for premium storage disks.
Option C is incorrect. NVv3 does not support Live migration.
Option D is incorrect. NDv2- series VMs won’t meet the requirements for the host pool.
References: 
To know more about various VM sizes, please visit the below-given links: 

https://docs.microsoft.com/en-us/azure/virtual-machines/sizes
https://docs.microsoft.com/en-us/azure/virtual-machines/nvv3-series
https://docs.microsoft.com/en-us/azure/virtual-machines/dv4-dsv4-series
https://azure.microsoft.com/en-in/updates/ndv2series-vms-are-now-generally-available/
https://docs.microsoft.com/en-us/azure/virtual-machines/av2-series