A security technician is testing a solution that will prevent outside entities from spoofing the company's email domain, which is comptia.org. The testing is successful, and the security technician is prepared to fully implement the solution. Which of the following actions should the technician take to accomplish this task?
A. Add TXT @ "v=spfl mx include:_spf.comptia.org -all" to the DNS record.
B. Add TXT @ "v=spfl mx include:_spf.comptia.org -all" to the email server.
C. Add TXT @ "v=spfl mx include:_spf.comptia.org -all" to the domain controller.
D. Add TXT @ "v=spfl mx include:_spf.comptia.org -all" to the web server.
Answer: A. Add TXT @ "v=spfl mx include:_spf.comptia.org -all" to the DNS record.
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