Generally speaking, what does TCP/IP do in the context of the Internet?

Generally speaking, what does TCP/IP do in the context of the Internet?

                 It is the governing board of the Internet

                 It sets policy that restricts which countries can have access to the Internet at which times

                 It specifies how data should be formatted, addressed, transmitted, routed and received

                 It translates signals from your computer into specific media, such as music or graphics

                 It ensures that open source software remain free to the public