Which of the following statements is not true for  $C{e}^{3+}$ and  $Y{b}^{3+}$ ?

$C{e}^{3+}$  has one unpaired e- and absorb light from 
uv-region so colourless. $C{e}^{3+}$ show f-f transition as well as f-d transition.
Electronic configuration of  $C{e}^{3+}=\left[Xe\right]4f^{1}5d^{0}6s^0$
Electronic configuration  $Y{b}^{3+}=\left[Xe\right]4f^{13}5d^{0}6s^0$
$Y{b}^{3+}$  also contain one unpaired electron and show f-f transition. Thus option d is false