DNS is the most correct answer, using both TCP and UDP ports 53 natively.
FTP uses TCP port 20 and 21.
DHCP uses UDP ports 67 and 68.
HTTP uses TCP port 80, but can also use UDP if adapted to do so. DNS remains the most correct answer because HTTP must be adapted to support UDP, while DNS has always supported both.
The correct answer is B.53 DNS.
DNS uses TCP for Zone transfer and UDP for name, and queries either regular (primary) or reverse. UDP can be used to exchange small information whereas TCP must be used to exchange information larger than 512 bytes.
More information:
https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/dns-works-on-tcp-and-udp
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