Let $A$ and $B$ be two sets such that $n(A)=3$ and $n(B)=2$. If $(x, 1), (y, 2), (z, 1)$ are in $A \times B$,find $A$ and $B$,where $x, y$ and $z$ are distinct elements.
- A$A = \{x, y, z\}, B = \{1, 2\}$
- B$A = \{x, y\}, B = \{1, 2, z\}$
- C$A = \{x, z\}, B = \{1, 2, y\}$
- D$A = \{y, z\}, B = \{1, 2, x\}$
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