Answer:
a. backdoor
backdoor (also called a trapdoor) is a programming routine built into a system by its designer or programmer. It enables the designer or programmer to bypass system security and sneak back into the system later to access programs or files.
Answer:
abd
Explanation:
connections usually occur through a public network
cool devices in a large geographic area
typically uses Ethernet and wirless routers to connect device
very independent : ) we use it for everything