Answer:
The correct answer is National Service Provider.
Step-by-step explanation:
The networks of Internet service providers could be considered as a super set of business networks, especially large corporations. The big difference is that a bank has to attend only to the traffic requirements between the networks of its own offices, while an ISP serves hundreds, thousands or millions of different clients, and it is important to guarantee the "tightness" of the various groups , so that they don't see each other directly, and in turn, everyone can access the Internet.