he requirement for high availability within the Data Center network may cause the designer toconsider which one of the following solutions？（）

• A、 Construct a hierarchical network design using EtherChannel between a server and two VDCsfrom 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 usingactive/active model that is more predictable in failure conditions