Which of the following firewall rules only denies DNS zone transfers?

Denying UDP on port 53 would block standard DNS query and response traffic, not zone transfers, because normal DNS lookups use UDP port 53.

Denying all IP traffic from any source to any destination would block all network communication entirely, which is far broader than only blocking DNS zone transfers.

DNS zone transfers are conducted over TCP port 53 because the full zone data often exceeds the 512-byte limit of UDP DNS packets, requiring the reliability of TCP. Denying TCP traffic on port 53 specifically targets zone transfer requests without disrupting standard DNS name resolution, which relies on UDP port 53. This makes it the precise and correct rule to block only zone transfers.

'deny all dns packets' is not valid or standard firewall rule syntax, and even conceptually it would block all DNS traffic indiscriminately, not just zone transfers.