What is the purpose of the nickname in TRILL switch settings?

A.
The nickname identifies the TRILL region and must match on every TRILL RBridge in the
region.
B.
Administrators can use the nicknames to identify switches in CLI output.
C.
The nickname is the first factor for electing a root bridge
D.
TRILL RBridges use the nicknames as source and destination addresses in TRILL
headers
i think answer D
anyone can Help
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Hi
any one can confirm ?
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I also think is D
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SURE D
EXPLANATION:
The two-octet nicknames are used to specify the ingress and egress RBridges in the TRILL header.
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D
An RBridges forward frames through TRILL network based on source and destination nicknames.
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