Which step must be completed prior to performing the initial configuration of a UnityVSA system and creating
the first storage pool?

A.
Create an ESXi host profile

B.
License the system for NFS and SMB support

C.
Add vDisks to the storage appliance

D.
Install license keys for thin provisioning

Explanation:
UNITY VSA STORAGE POOL CREATION
1. Under the Storage Pool Section go to Pools. Select the + to start the “Create Pool Wizard”.
2. Name the Pool
3. Assign a Tier to each Virtual Disk attached to the VSA. You have Extreme, Performance and Capacity.

Etc.
https://samshouseblog.com/2016/06/08/unity-vsa-storage-pool-creation/