The correct option is letter c. Written communication. Memos, emails and reports constitute a type of written communication.
What is written communication?
Corresponds to a form of communication where information is written and is not carried out in real time, such as verbal communication, but is sent, received, read and responded to if necessary, such as letters, emails and memos.
Therefore, written communications are an effective, fast and inexpensive form of communication, being widely used by organizations to establish communication with several people at the same time.
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