In Ellingham diagrams of ${∆}_{\mathrm{r}}\mathrm{G}$ oxide formation ${\mathrm{V}}_{\mathrm{s}}\mathrm{T}$, which of the following graphs has negative slope?

1. C $\to$ CO

2. Fe $\to$ Fe₂O₃

3. Mg $\to$ MgO

4. All of the above

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