The question is, A penetration tester is conducting an assessment on Comptia.org and runs the following command from a coffee shop while connected to the public Internet:
C:nslookup -querytype=MX comptia.org
Server: Unknown
Address: 198.51.100.45
Comptia.org MX preference=10, mail exchanger= 92.68.102.33
Comptia.org MX preference=20, mail exchanger= exchg1.comptia.org
Exchg1.comptia.org internet address= 192.168.102.67
Which of the following should the penetration tester conclude about the command output? The answer choices are below and please provide an explanation.
A. The public/private views on the Comptia.org DNS servers are misconfigured
B. Comptia.org is running an older mail server, which may be vulnerable to exploits
C. The DNS SPF records have not been updated for Comptia.org
D. 192.168.102.67 is a backup mail server that may be more vulnerable to attack