Consider the two-port resistive network shown in the figure. When an excitation of $5$V is applied across Port $1$, and Port $2$ is shorted, the current through the short circuit at Port $2$ is measured to be $1$ A (see (a) in the figure).
Now, if an excitation of $5$ V is applied across Port $2$, and Port $1$ is shorted (see(b) in the figure), what is the current through the short circuit at Port $1$?
1. $\text{0.5 A}$
2. $\text{1 A}$
3. $\text{2 A}$
4. $\text{2.5 A}$