The relation defined by the table is a function. Choose the correct domain and range. 
Definitions:
Closest Friends
Individuals who are most intimately connected and trusted in a person's social circle, often sharing deep personal ties and mutual support.
Dyad
A two-person social group.
Triad
A three-person social group.
Stable
A condition or situation that is not easily changed or likely to move or fail, maintaining equilibrium or consistency over time.
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