Statement I : A tetrahedral complex containing all mono dentate ligands cannot exhibit geometrical isomerism

Statement II : All the ligands are at equivalent positions in a tetrahedral complex

${\mathrm{L}}_1,{\mathrm{L}}_2,{\mathrm{L}}_3,{\mathrm{L}}_4$are at equivalent positions. Irrespective of the nature of ligand and change in spatial arrangements,  the ligands will be at equivalent positions.

It means  

It can show optical but not geometrical isomerism.