The communication type that is being used in the following example is: 4) internal informal communication.
Internal informal communication is a type of communication that occur between two people in a workplace or work environment in which they casually interact with each other.
Based on the given scenario although the two employee were discussing about the company meeting but their communication is not a formal communication based on the fact their discussion is casual and unofficial.
Inconclusion the communication type that is being used in the following example is: 4) internal informal communication.
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