How many bytes of payload are in this datagram $($i$.$e$.,$ the datagram containing the first UDP segment sent by your computer via the traceroute command to gaia.cs$.$umass.edu$),$ and how did you determine this? Choose one of the following answers.

Group of answer choices

$56$ bytes. In Wireshark, when I expand the Internet Protocol information, I see "Total length: $56".$

$36$ bytes. The Internet header is $20$ bytes long, and I see that the total length of the IP datagram is $56$ byes.

$20$ bytes. The length of an IP datagram payload is always $20$ bytes.

There's not enough information to answer this question.