An IT administrator has installed new DNS name servers (Primary and Secondary), which are
used to host the company MX records and resolve the web server’s public address. In order to
secure the zone transfer between the primary and secondary server, the administrator uses only
server ACLs. Which of the following attacks could the secondary DNS server still be susceptible
to?

A.
Email spamming

B.
IP spoofing

C.
Clickjacking

D.
DNS replication