B
UDP have no control when sends packets
so, when you create application and use UDP protocol u must create your own control system on the application layer
B is correct answer
User Datagram Protocol (UDP): provides connectionless communication and does not guarantee the reliability of packet transmission. The reliability can be ensured by the application layer.
It's B, an application is mostly operating with UDP and a dynamic port, the application itself has to ensure the reliability of the connection or at least the send data. If data is lost, the application layer has to send resend request/channel reopening.
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