Which of the following transport layer protocols guarantees reliable, in-order data delivery and establishes a connection using a three-way handshake ?
None of the above
The protocol described is the Transmission Control Protocol (TCP), and TCP is not among the four options, so none of them can be right.
TCP is the connection-oriented transport protocol. It opens a session with the three-way handshake of SYN, SYN-ACK and ACK, numbers every byte it sends, acknowledges what arrives, retransmits what is lost and reorders segments before handing them up, which is exactly what "reliable, in-order delivery" means.
The listed protocols do other jobs. UDP is a transport protocol but a connectionless one, with no handshake, no acknowledgement and no reordering. DNS is an application-layer service that resolves names to addresses. ARP maps an IP address to a MAC address on the local link. ICMP carries error and diagnostic messages such as those used by ping.
Since TCP is not offered, the answer is None of the above.
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