Which of the following is the MOST efficient to utilize?

A penetration tester wants to script out a way to discover all the RPTR records for a range of IP addresses.

Which of the following is the MOST efficient to utilize?
A . nmap -p 53 -oG dnslist.txt | cut -d “:” -f 4
B . nslookup -ns 8.8.8.8 << dnslist.txt
C . for x in (1…254); do dig -x 192.168. $x. $x; done
D . dig -r > echo “8.8.8.8” >> /etc/resolv/conf

Answer: C

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