A company wants to host a publicly available server that performs the following functions: ✑ Evaluates MX record lookup ✑ Can perform authenticated requests for A and AAA records ✑ Uses RRSIG Which of the following should the company use to fulfill the above requirements? 

Answer options:

A. DNSSEC
B. SFTP
C. nslookup
D. dig
E. LDAPS

A

DNS Security Extensions (DNSSEC) provides, among other things, cryptographic authenticity of responses using Resource Record Signatures (RRSIG) and authenticated denial of existence using Next-Secure (NSEC) and Hashed-NSEC records (NSEC3).