Which UnityVSA storage resource can be configured with Host I/O limits?

A.
NAS Server

B.
Pool

C.
File System

D.
LUN

Explanation:
Host I/O limits is a feature which allows the user to control the amount of throughput and bandwidth consumed
by block resources.
This feature can be applied to LUNs, VMFS datastores, or attached snapshots.
https://www.emc.com/collateral/white-papers/h15092-emc-unity-unity-vsa.pdf (Page 16)