What is required for proper implementation of jumbo frame support on a Cisco Nexus 2000 Series Fabric Extender？（）    

• A、 The interface configured as FEX fabric requires the MTU to be set to jumbo.
• B、 The service policy must be applied to the system QoS.
• C、 The device defaults to jumbo frame support； no changes are required.
• D、 The switchport in the FEX interface must be set to MTU 9216.