Performing a DNS lookup with dig results in this answer:
A . There is no . after linuserv.example.net in the PTR record in the forward lookup zone file
B . There is no . after linuserv in the PTR record in the forward lookup zone file
C . There is no . after linuserv.example.net in the PTR record in the reverse lookup zone file
D . The . in the NS definition in the reverse lookup zone has to be removed
Answer: C
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