GATE Electronics and Communications (EC) 2019 Solved Paper

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