Question $30(4$ points$)$

Suppose a process in Host C has a UDP socket with port number $12345.$ Suppose each of Host A and Host B sends a UDP segment to Host C with destination port number $12345.$ Which of the following is NOT a possible combination of source port numbers of the UDP segments from Host A and Host $B?$

$12345,12345$

$12345,23456$

$23456,12345$

$34567,54321$

$123456,234567$

$23456,23456$