How is it used? As in an official worker? If so, it would most likely set the mood as Intense in some ways.
Suffix so it would be c suffix
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It is defining.
Defining relative clause does not have a comma, while a non-defining relative clause has.
For example, if the sentence is:
The children, who hate chocolates, are uncommon.
- since there is comma in this sentence, it is non-defining.
- while if there is no comma like the question in the picture, it is defining.