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The residues of a complex function $X(z)=\frac{1-2 z}{z(z-1)(z-2)}$ at its poles are

1. $\frac{1}{2},-\frac{1}{2}$ and $1$
2. $\frac{1}{2}, \frac{1}{2}$ and $-1$
3. $\frac{1}{2}, 1$ and $-\frac{3}{2}$
4. $\frac{1}{2},-1$ and $\frac{3}{2}$