The correct answer is C.
OBJ-2.1: Text (TXT) records are used to provide information about a resource such as a server, network, or service human-readable form. They often contain domain verification and domain authentications for third-party tools that can send information on behalf of a domain name. Mail Exchange (MX) records are used to provide the mail server that accepts email messages for a particular domain. Nameserver (NS) records are used to list the authoritative DNS server for a particular domain. Service (SRV) records are used to provide host and port information on services such as voice over IP (VoIP) and instant messaging (IM) applications.