Which one among the following has completed thirty years of its development on 1st January, 2013?

The Transmission Control Protocol/Internet Protocol (TCP/IP) suite completed thirty years of its development on January 1, 2013. This date is historically significant because on January 1, 1983, the ARPANET officially transitioned from the older Network Control Protocol (NCP) to the TCP/IP standard [1]. This event, often referred to as the 'flag day' transition, required all hosts on the network to convert simultaneously to the new protocol suite [1]. Because this transition established a standardized method for different networks to communicate, January 1, 1983, is widely celebrated as the official birthday of the modern Internet. Consequently, by January 1, 2013, the TCP/IP protocol had been the operational standard of the global internet for exactly thirty years. While NCP was the predecessor, it was phased out during this 1983 transition [1].

Sources

1. [1] https://www.sciencedirect.com/topics/computer-science/arpanet