在实现基于TCP的网络应用程序时，服务器端正确的处理流程是( )
socket() -> bind() -> listen() -> connect() -> read()/write() -> close()
socket() -> bind() -> listen() -> read()/write() -> close()
socket() -> bind() -> listen() -> accept() -> read()/write() -> close()
socket() -> connect() -> read()/write() -> close()
