单项选择题
WhenanewtrunklinkisconfiguredonanIOSbasedswitch,whichVLANsareallowedoverthelink?（）
- A.Bydefault，alldefinedVLANsareallowedonthetrunk.
B.EachsingleVLAN，orVLANrange，mustbespecifiedwiththeswitchportmodecommand.
C.EachsingleVLAN，orVLANrange，mustbespecifiedwiththevtpdomaincommand.
D.EachsingleVLAN，orVLANrange，mustbespecifiedwiththevlandatabasecommand.
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