That is something that changes constantly. (You haven't said which period ). At the present time I would say it is secure digital communication.
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Ethernet cables are the most common type of communication cable. Other types of communication cables are telephone and DSL cables.
Some common communication theories are interpersonal communication, group communication and mass communication. There are many more theories but these three are the most common.
Communication is not invented, its an instinct. Language is the most common type of communication among humans. Animals communicate too by using their sound, body language and even its own scent.
The most common form of business communication within a business is a memo. This is usually distributed by email rather than a hard copy. The most common form of business communication between companies is an email letter.
The most common blood type is O.
The most common blood type is the o+ blood type.
The most common blood type is A positive and the most rare is type O.
no
no
Non-verbal
Morse Code
buang