He network became functional in 1969, linking scientific and academic researchers across the united states.

ARPANET Network.

Explanation:

ARPANET network was the basis for the internet. It was created under the direction of the U.S. Advanced Research Project Agency which is often called ARPA. This is why the network is called ARPANET. The major purpose of the network was to enhance communication. Also, it made good use of the new idea of sending message in small units which were referred to as packets. These units could be sent along different paths and reconstructed at their destination.

it's called a focal point

c is the answerr