Question: A DNS zone transfer attack might allow an attacker to set up a new unauthorized DNS server under their control. How would you prevent it

A DNS zone transfer attack might allow an attacker to set up a new unauthorized DNS server under their control.
How would you prevent it?
Question 17Answer
a.
By properly configuring the secondary DNS server to only transfer zones to authorized primary servers
b.
By properly configuring the primary DNS server to only transfer zones to authorized secondary DNS servers
c.
By closing the port UDP 53 from Internet
d.
By closing the port TCP 53 from Internet
e.
By properly configuring the secondary DNS server to retrieve zones from only an authorized primary server

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