单项选择题
WhatwouldbethecauseforthefollowingfaultinUCSManager？（）"etherVIFx／xxxdown，reason：ENMsourcepinningfailed"
A.TheassociatedVLANsofavNICarenotfoundonanuplink.
B.OverlappingVLANIDsexistonupstreamdisjointnetworks.
C.ThevNICwasnotconfiguredforfabricfailover.
D.ThevNICispinnedtothewrongfabric.
E.OverlappingVSANIDsexistonupstreamSANswitches.
F.ThevHBAwasnotconfiguredforfailover.