Select which of the following is incorrect order of I.E. ?

$\begin{array}{ccc}\mathrm{Cu}& \mathrm{Ag}& \mathrm{Au}\\ 3{\mathrm{d}}^{10}4{\mathrm{s}}^1& 3{\mathrm{d}}^{10}5{\mathrm{s}}^1& 4{\mathrm{f}}^{14}5{\mathrm{d}}^{10}6{\mathrm{s}}^1\end{array}$

In Au, poor screening is provided by 4f subshell e^-.

$\therefore$Z_eff increases and ionization energy also increases.

$\therefore$Au > Cu > Ag is correct order.