Explanation:

- Option 1: PANET

This is not a known prototype or network related to the development of the Internet.

- Option 2: ARPANET

- ARPANET stands for Advanced Research Projects Agency Network.

- It was the first working prototype of the Internet.

- Developed by the U.S. Department of Defense in the late 1960s.

- Connected a few research universities and institutions to share resources and data.

- Introduced concepts that formed the basis of the modern Internet.

- Option 3: APNET

This is another option that does not correspond to a recognized network involved in the history of the Internet.

- Option 4: ANET

Like APNET and PANET, ANET is not associated with the evolution of the Internet.

Option 2: ARPANET is the correct answer.