Which of the following is the best description of well known ports?

A.
Well known ports apply to routers only and are used for communication and control
traffic. Well known port numbers are assigned by IANA and can have any value.

B.
Well known ports are used by TCP and UDP. Well known port numbers range from 1024
to 65535 and are assigned by IANA.

C.
Well known port numbers are used by both TCP and UDP. Well known port numbers
range from 1 to 1023 and are assigned by IANA.

D.
Well known ports numbers are used by TCP only. Well known port numbers are
assigned by IANA and can have any value.