What is the general electronic configuration of transiton elements?

Question

$\begin {array} {1 1} (n-1) d^{1-10}ns^{1-2} \\ (n-1) d^{1-10}ns \\ n^2d^{1-10}s^{1-2}\\(n-1) d^{1-8}ns^{1-2} \end {array}$