Consider the configuration shown in the figure which is a portion of a larger electrical network
For $R = 1\: \Omega$ and currents $i_{1} = 2A,i_{4} = -1A,i_{5} = -4A,$ which one of the following is $\textbf{TRUE}?$
- $i_{6} = 5A$
- $i_{3} = -4A$
- Data is sufficient to conclude that the supposed currents are impossible
- Data is insufficient to identify the currents $i_{2},i_{3},$ and $i_{6}$