In data communication networks, which protocol is responsible for ensuring reliable data transfer between devices over a network?       

Transmission Control Protocol (TCP) is responsible for providing reliable, ordered, and error-checked delivery of data between devices over a network. TCP ensures that data packets are transmitted correctly, in the correct order, and without errors, making it ideal for applications requiring reliability, such as file transfers and web communications. TCP uses acknowledgments and retransmissions to guarantee that the data reaches its destination. A (Incorrect): HTTP is an application-layer protocol used for transmitting web pages over the internet, but it does not provide reliability at the transport layer like TCP. B (Incorrect): IP (Internet Protocol) is responsible for addressing and routing packets between devices, but it does not ensure reliable delivery by itself. C (Incorrect): FTP (File Transfer Protocol) is an application-layer protocol for transferring files, but it relies on TCP for reliable data transfer. E (Incorrect): UDP (User Datagram Protocol) is a connectionless protocol that does not guarantee reliable data transfer; it is used when speed is more important than reliability.