Which of the following statements are true for UDP?

I. UDP provides unreliable but best$-$effort service.

II$.$ UDP is connectionless.

III. UDP may be used in applications such as multimedia streaming, DNS$,$ HTTP$/3.$

IV$.$ UDP is a connection$-$oriented protocol with a handshaking mechanism.

V$.$ UDP is a simple protocol with a small header.

VI$.$ UDP may be used in real$-$time video and voice communications in whcich a certain level of data loss is acceptable.