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Currect answer is C.
113 port is used for Identification / Authorization service, TCP and UDP
69 port is Trivial File Transfer Protocol (TFTP), UDP
161 port Simple Network Management Protocol (SNMP), TCP and UDP
Why on earth does anybody think you need to know this? If I can't remember it, I'll look it up in an instant. It does not make me a better professional knowing this by heart.
Answer is C; NTP time servers work within the TCP/IP suite and rely on User Datagram Protocol (UDP) port 123 https://www.cisco.com/c/en/us/support/docs/ip/network-time-protocol-ntp/108076-ntp-troubleshoot.html#:~:text=NTP%20time%20servers%20work%20within,Protocol%20(UDP)%20port%20123.
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