A thin, conducting spherical shell of radius \(a\) carries a net positive charge \(+Q\). It is concentric with a larger thin, conducting spherical shell of radius \(b\) (where \(b > a\)) that is connected to ground, setting its electric potential to zero. Which of the following correctly pairs the electric potential \(V_a\) at the surface of the inner shell with the net charge \(Q_{\text{outer}}\rangle\) induced on the outer shell?