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B and D both (Hold IP Address)...MX is (Mail Exchange)
Commonly used record types
A (Host address)
AAAA (IPv6 host address)
ALIAS (Auto resolved alias)
CNAME (Canonical name for an alias)
MX (Mail eXchange)
NS (Name Server)
PTR (Pointer)
SOA (Start Of Authority)
SRV (location of service)
TXT (Descriptive text)
DNS records are used to map domain names to IP addresses. The following DNS record types hold an IP address:
A Record: An A record maps a domain name to an IPv4 address. It is one of the most basic and commonly used DNS record types.
AAAA Record: An AAAA record maps a domain name to an IPv6 address. It is similar to an A record, but it holds IPv6 addresses instead of IPv4 addresses.
Therefore, the correct answers are D and B.
AAAA holds IPv6 addresses; A records hold IPv4 addresses; the MX record typically contains the FQDN of the mail server (i.e. mail.domain.com) as opposed to an IP address.
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