Identify the correct order in which a server process must invoke the function calls accept, bind, listen, and recv according to UNIX socket API.

In a standard TCP connection using the UNIX socket API, the server process follows these steps:

1. socket() creates an endpoint for communication.

2. bind() assigns a local protocol address (IP address and port) to the socket.

3. listen() marks the socket as passive, indicating that it will be used to accept incoming connection requests, and specifies a backlog queue.

4. accept() extracts the first connection request on the queue of pending connections and creates a new connected socket.

5. recv() reads data received from the client over the established connection.

Therefore, the correct invocation sequence is bind, listen, accept, recv, which corresponds to option (B).