QUESTION $4$

The Internet is tiered system of computers and networks that work together to provide world communication. The Internet backbone is connected via $\_\_\_$ to regional Internet Service Providers $($ISPs$),$ which service point of presence $($POP$)$ ISPs that connect to business, education, and home networks.

a$.$ Network Control Points

b$.$ Network Access Switches

c$.$ Network Operations Centers

d$.$ Network Access Points