What is the function of the DNS TTL (Time-to-Live) on a record, and what tradeoff exists between very short and very long TTL values?

• A.DNS TTL controls the frequency of zone transfers between primary and secondary DNS servers
• B.DNS TTL specifies the maximum hop count for DNS queries; after the TTL decrements to 0 at the 16th resolver, the query is dropped; an A record maps a hostname to an IPv6 address, while AAAA records hold IPv4. The hosts file is consulted only after every configured DNS server has timed out. EDNS0 extends DNS by fragmenting every response into 512-byte chunks. Dynamic DNS updates require the client to perform a zone transfer first
• C.DNS TTL is a security feature that expires old DNS records automatically when IP addresses change; it has no performance impact, and hosts renew leases by contacting any DHCP server, not the one that issued the lease, as the protocol keeps no server identity. An A record maps a hostname to an IPv6 address, while AAAA records hold IPv4. A lame delegation is a record whose TTL exceeds the parent zone's serial
• D.