What happens when a UDP datagram is larger than the buffer passed to a basic recvfrom() c…

What happens when a UDP datagram is larger than the buffer passed to a basic recvfrom() call?

1. The remainder is returned by the next recvfrom() call.
2. The call waits until the application provides a larger buffer.
3. The returned payload is truncated; the remainder is not a second datagram fragment for the application to read.
4. UDP transparently converts the datagram into a TCP stream.