Which of the following port numbers could appear in the sour

Which of the following port numbers could appear in the source port field of a TCP header leaving a requesting system?

A. 1022

B. 1023

C. 49172

D. 80

Answer is C.

Source port numbers from a requesting machine are dynamic and must not be from the well known port range 0-1023

could not be A,B and D all the port numbers are well known port numbers which cannot be used here.