A company has a data center that hosts multiple tenants. The company is adding a second and third data center. The core of each data center is an IRF
virtual switch.
These are the IRF connections:
IRF 1 is the core of the first data center.
IRF 2 is the core of the second data center.
IRF 3 is the core of the third data center.
The three data centers are fully interconnected with dark fiber.
IRF 1, IRF 2, and IRF 3 have connections to a WAN and to the Internet.
Which option for the connections between the data centers provides the best resiliency and stability?

A.
a link aggregation that consists of all of the links

B.
MSTP running on the links

C.
IRF 1,IRF 2,and IRF 3 combined into a single IRF virtual device

D.
SPBM configured across IRF 1, IRF 2, and IRF 3

Explanation:
http://h17007.www1.hp.com/docs/reports/irf.pdf