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 the above