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Answer:
A speed govenor
Explanation:
speed governor is an electronic device linked to the gearbox where sensors capture the movement of the vehicle. If the vehicle exceeds the specified speed limit, the device automatically slows the vehicle.
I may be wrong, BUT here is what i think
b) line graph
d) pie graph
1.Extended border node (EBN)
2.Central directory server (CDS)
3.Branch extender (BEX or BrEx or BrNN)