An organization has one HP 10508 switch at the core of its campus LAN. The network
administrator wants to implement Intelligent Resilient Framework (IRF) at the core of this campus
LAN and asks you what he must purchase to implement IRF. What should you recommend?

A.
one 10508 switch

B.
one 10508 switch and one IRF license

C.
one 10508 switch and two IRF licenses

D.
two 12900 switches, because the 10508 switch does not support IRF

Explanation:
There is something wrong about the options of this question. I am unable to find any
sources for any of the four options.