If $A \times B = \{(a, x), (a, y), (b, x), (b, y)\}$,find $A$ and $B$.
- A$A = \{a, b\}, B = \{x, y\}$
- B$A = \{a, x\}, B = \{b, y\}$
- C$A = \{x, y\}, B = \{a, b\}$
- D$A = \{a, y\}, B = \{b, x\}$
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