Let $f = \{(1, 1), (2, 3), (0, -1), (-1, -3)\}$ be a linear function from $\mathbb{Z}$ into $\mathbb{Z}$. Find $f(x)$.
- A$f(x) = 2x - 1$
- B$f(x) = x + 1$
- C$f(x) = 3x - 2$
- D$f(x) = 2x + 1$
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