When a voltage \(V_{\mathrm{x}}\) is applied across the input port, the short-circuit current at the output port is \(I_{2 S C}\). When the same voltage is applied across the output port, the short-circuit current at the input port is \(I_{1 \mathrm{SC}}\). Show that reciprocity \(\left(I_{1 \mathrm{SC}}=Iight.\) \({ }_{2 \mathrm{SC}}\) ) requires that \(h_{12}=-h_{21}\).