What would be the cause for the following fault in UCS Manager？（）  "ether VIF x / xxx down， reason： ENM source pinning failed"

• A、 The associated VLANs of a vNIC are not found on an uplink.
• B、 Overlapping VLAN IDs exist on upstream disjoint networks.
• C、 The vNIC was not configured for fabric failover.
• D、 The vNIC is pinned to the wrong fabric.
• E、 Overlapping VSAN IDs exist on upstream SAN switches.
• F、 The vHBA was not configured for failover.