Which of the following DNS record types should the technician modify to minimize this problem?

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A technician is moving a company to a cloud email service. Several external recipients are reporting that email sent from the company is going to their junk folders because the sender’s identity cannot be verified .

Which of the following DNS record types should the technician modify to minimize this problem?
A . CNAME
B . PTR
C . TXT
D . SRV

Answer: B