Find the union of each of the following pairs of sets:
$A = \{1, 2, 3\}, B = \varnothing$
$A = \{1, 2, 3\}, B = \varnothing$
- A$A \cup B = \{1, 2, 3\}$
- B$A \cup B = \{1, 2\}$
- C$A \cup B = \varnothing$
- D$A \cup B = \{3\}$
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