Question: What happens when a client utilizes the pipelined start-up feature to initiate a connection with a server that does not support this feature, in the context of Transparent end-to-end Packet-switched Streaming Service (PSS)?
Option 1: The first setup interaction fails immediately due to the server's lack of support for pipelined start-up.
Option 2: The first setup interaction is successful because the client hasn't used the 'Require' header, but subsequent interactions will fail.
Option 3: The server automatically upgrades to support pipelined start-up to accommodate the client's request.
Option 4: The client is redirected to an alternative server that supports pipelined start-up.
Explanation: In PSS, if a client uses the pipelined start-up feature with a server that doesn't support it, and the 'Require' header is not included in the initial request (indicating that the client can proceed without the server's support for this feature), the first setup interaction can indeed be successful. However, subsequent interactions may encounter issues due to the mismatch in supported features.