Which of the following complexes can exhibit square planar geometry ?

Which of the following complexes have square planar shape?

Square planar complexes are generally formed by d^(8) ions with strong field ligands. The crystal field splitting is larger for second and third row transition elements and for more highly charged species. All the complexes having 4d^(8)" and "5d^(8) configuration are mostly square including those with weak field ligands such halide ions. Square planar complexes with coordination number four can show diastereoisomerism. Amongst the following complexes which has square planar geometry ?

Which among the following complexes has square pyramidal geometry ?

Which has square planar geometry

Which of the following species has square planar geometry ?