The Internet Is a Hierarchical Structure Linking Different Levels of Service

The Internet is a hierarchical structure linking different levels of service providers whose millions of devices supply all the interconnections.The three levels outlined in the book from the top down include _____________________.

A) New system provider (NSP) , current system provider (CSP) , and order entry system provider (OSP)
B) National service provider (NSP) , regional service provider (RSP) , and Internet service provider (ISP)
C) Net server point (NSP) , radio server point (RSP) , and Internet server point (ISP)
D) None of these