Final answer:
Two main functions include providing such info for domain verification or security measures, and they are not used to direct internet traffic. Therefore, the correct answers to the question are c) and d).
Step-by-step explanation:
DNS TXT (Text) records are used to store arbitrary text data associated with a domain. This information can be retrieved by external services for various purposes such as domain verification, authentication, and configuration. It is commonly used in conjunction with SPF (Sender Policy Framework) records for email authentication and DKIM (DomainKeys Identified Mail) for email validation. Unlike other DNS record types such as A (Address) or CNAME (Canonical Name), TXT records are not designed to direct network traffic. Instead, they serve to store human-readable information that can be queried by external systems without influencing the flow of data on the network.
DNS TXT records themselves don't directly facilitate multiple domain names resolving to the same IP address. The functionality you're referring to is typically achieved through other DNS record types, such as CNAME (Canonical Name) records. CNAME records allow multiple domain names to alias to the same canonical domain, which can then be associated with a specific IP address through an A (Address) or AAAA (IPv6 Address) record. TXT records, on the other hand, are more informational and are not involved in the direct mapping of domain names to IP addresses for routing network traffic.