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In the figure is $\mathrm{A}^{1} \mathrm{~A}^{2}$ and $\mathrm{A}^{3}$ are ideal ammeters. If $\mathrm{A}^{1}$ reads $5 \mathrm{A}, \mathrm{~A}^{2}$ reads $12 \mathrm{A}$, then $\mathrm{A}^{3}$ should read.

  1. $7 \mathrm{~A}$
  2. $12 \mathrm{~A}$
  3. $13 \mathrm{~A}$
  4. $17 \mathrm{~A}$

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