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In the given figure, $A_{1}, A_{2}$ and $A_{3}$ are ideal ammeters. If $\mathrm{A}_{2}$ and $\mathrm{A}_{3}$ read $3 \mathrm{~A}$ and $4 \mathrm{~A}$ respectvely, then $A_{1}$ should read

1. $1 \mathrm{~A}$
2. $5 \mathrm{~A}$
3. $7 \mathrm{~A}$
4. None of these