QUESTION $$

$1$

Data $$has $$been $$with $$us $$for $$a $$long $$time$.$Smoke $$signals$,$drum $$beats$,$and $$semaphore $$signals $$are $$examples $$that $$are $$commonly $$given; $$indeed$,$semaphore $$relay $$may $$be $$regarded $$as $$the $$first $$modern $$communication $$network$.$

communication

programs.

problems

network