Question: 4 . Which protocol uses TCP ( Transmission Control Protocol ) port 2 1 for sending control commands? a . FTP ( File Transfer Protocol

4. Which protocol uses TCP (Transmission Control Protocol) port 21 for sending control commands?
a.
FTP (File Transfer Protocol)
b.
ARP (Address Resolution Protocol)
c.
IMAP (Internet Message Access Protocol)
d.
ICMP (Internet Control Message Protocol)

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