You are considering adding a child domain to the dandenong.melbourne.victoria.
australia.contoso.com domain tree.
Which of the following represents the maximum length in characters, including periods, of an Active
Directory domain name?

A.
64 characters
B.
128 characters
C.
256 characters
D.
512 characters
Correct
https://technet.microsoft.com/en-us/library/active-directory-maximum-limits-scalability(v=ws.10)#BKMK_FQDN
Fully qualified domain names (FQDNs) in Active Directory cannot exceed 64 characters in total length, including hyphens and periods (.). For example, the following host name has 65 characters; therefore, it is not valid in an Active Directory domain:
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