If $A \times B = \{(p, q), (p, r), (m, q), (m, r)\}$,find $A$ and $B$.
- A$A = \{p, m\}, B = \{q, r\}$
- B$A = \{p, q\}, B = \{m, r\}$
- C$A = \{q, r\}, B = \{p, m\}$
- D$A = \{p, r\}, B = \{m, q\}$
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