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

Explanation:
Cisco Nonstop Forwarding (NSF) works with the Stateful Switchover (SSO) feature in Cisco IOS software. NSF works with SSO to minimize the amount of time a
network is unavailable to its users following a switchover. The main objective of Cisco NSF is to continue forwarding IP packets following a Route Processor (RP)
switchover.