Which DNS record types and purposes are commonly used for domain name resolution and mail routing?

• A. A maps domain to IPv4; AAAA maps to IPv6; CNAME provides an alias to another domain; MX designates mail servers for the domain.
• B. A maps domain to IPv4; AAAA maps to IPv6; CNAME maps to an IP address because it is a direct record; MX maps to web servers.
• C. A maps domain to IPv4; AAAA maps to IPv6; NS stores name servers for the domain; MX maps to web servers.
• D. A maps domain to IPv4; AAAA maps to IPv6; CNAME maps to hostnames; MX designates mail servers.

Answer: (A)