The requirement for high availability within the Data Center network may cause the designer to consider which one of the following solutions?

The requirement for high availability within the Data Center network may cause the designer to consider which one of the following solutions?
A . Construct a hierarchical network design using EtherChannel between a server and two VDCs
from the same physical switch
B . Utilize Cisco NSF with SSO to provide intrachassis SSO at Layers 2 to 4
C . Define the Data Center as an OSPF NSSA area, advertising a default route into the DC and
summarizing the routes out of the NSSA to the Campus Core
D . Implement network services for the Data Center as a separate services layer using an
active/active model that is more predictable in failure conditions

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Answer: B