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