What is the oversubscription ratio between the chassis and the upstream switch?

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You have a Cisco UCS Fabric Interconnect that connects to upstream switches via four 10-Gbps port channels. You have a fully populated Cisco UCS B-Series Blade Server chassis that has a UCS-IOM2208XP installed and uses all of the ports for the blade servers.

What is the oversubscription ratio between the chassis and the upstream switch?
A . 6:1
B . 3:1
C . 2:1
D . 4:1

Answer: B