Chapter 7.2, Problem 1CP

Which electron configuration is correct for a germanium (Ge) atom in the ground state?

$\begin{array}{l}\text{a)}\hfill \\ 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}4p^2\hfill \\ \text{b)}\hfill \\ 1s^{s}2s^{3}2p^{6}3s^{3}3p^{6}4s^{2}3d^{10}4p^2\hfill \\ \text{c)}\hfill \\ 1s^{2}2s^{2}2p^{6}3s^{2}3p^2\hfill \\ \text{d)}\hfill \\ 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}4p^{2}4d^{10}\hfill \\ \text{e)}\hfill \\ 1s^2{25}^{3}2p^{6}3S^{2}3p^{2}3d^{10}\hfill \end{array}$