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Question $3$

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The Internet is divided into three parts: network edges, access network, and core network. What is the most accurate description of network edges?

a$.$ The high$-$speed routers and switches forming the backbone of the Internet.

b$.$ Devices directly connected to the core infrastructure.

c$.$ Centralized servers managing content and services for all connected devices.

d$.$ The users of the endsystems of the network who access a services.