A computer repair person talking to a customer should never use jargon.
What is Jargon?
Jargon is the specialized vocabulary that is connected with a specific field or activity. Jargon is typically used in a specific communicative context and may be difficult to understand outside of that context.
The context is usually a specific occupation, however jargon can exist in any in-group. This includes that a surgeon giving orders to her staff, a plumber ordering parts from a supply store, and a coach telling a quarterback what play to use.
A computer repair person talking to a customer is not included in the use of jargon, as it does not require any specialized vocabulary in compare to the another examples given.
Therefore, option D is correct.
Learn more about the jargon, refer to:
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