Which statement about connection-oriented communication is true?

• A. It uses a three-way handshake to establish a connection
• B. It guarantees delivery without retries
• C. It sends data without any setup
• D. It does not establish a connection

Answer: (A)

Connection-oriented communication begins with establishing a session so both ends agree on how to exchange data. The three-step handshake is the classic way to set up that connection before any data is sent, enabling reliable and ordered delivery with acknowledgments and, if needed, retransmissions for lost packets. This setup step is what makes using a three-way handshake true for connection-oriented protocols like TCP. The other statements don’t fit because reliability is achieved through acknowledgments and retries, not guaranteed without retries; data isn’t sent without any setup—the connection must be established first; and a connection-oriented service does involve establishing a connection, not sending without one.