A galvanometer can be converted to a voltmeter of full-scale deflection \(V_{0}\) by connecting a series resistance \(R_{1}\) and can be converted to an ammeter of full-scale deflection \(I_{0}\) by connecting a shunt resistance \(R_{2}\). What is the current flowing through the galvanometer at its full-scale deflection ?
(A) \(\frac{\mathrm{V}_{0}-\mathrm{I}_{0} \mathrm{R}_{2}}{\mathrm{R}_{1}-\mathrm{R}_{2}}\)
(B) \(\frac{V_{0}+I_{0} R_{2}}{R_{1}+R_{2}}\)
(C) \(\frac{V_{0}-l_{0} R_{2}}{R_{2}-R_{1}}\)
(D) \(\frac{V_{0}+I_{0} R_{1}}{R_{1}+R_{2}}\)