An Isilon customer currently has an 8-node cluster of older X-Series nodes. They are planning
several upgrades over the next three years in the following stages:
Stage 1: Add 2 X-Series nodes to meet performance growth
Stage 2: Add 4 NL-Series nodes to meet archive capacity growth
Stage 3: Add 10 New X-Series nodes as a hardware refresh
Stage 4: Remove older X-Series nodes
At which stage will a SmartPool license be required?

A.
1

B.
2

C.
3

D.
4