$1\mathrm{.}7-1$ Reading an Internet RFC$.$ What is the purpose of the length $$eld in the UDP header?

Note: If you need to look for an answer, you may read through RFC $768($User Datagram Protocol$),$ which describes the UDP protocol. RFC $768$ is only three pages long $($the RFC $2616$ initial speci$$cation for HTTP $1\mathrm{.}1$ was $176$ pages!$).$

Based on your reading of RFC $768,$ answer the following question:

$$ It speci$$es the length in bytes of the UDP segment, including the header the payload data.

$$ It speci$$es the length in bytes of the UDP header for this UDP segment.

$$ It speci$$es the length in bytes of the payload data in the UDP segment.

$$ It speci$$es the maximum amount of time a UDP segment can wait at a host before being transmitted