A customer calls you to report that it receives an error when entering the pinning max-links 4 command in FEX configuration mode on its Cisco Nexus 5596T Switch. Which of these is a likely cause for this condition?
A. The FEX fabric interface is down.
B. The transceiver is incorrect.
C. A fabric interface is in a port channel.
D. The fabric interface switchport mode is set to Access.
E. Only two fabric interfaces are connected.