Which of the following ligand `(s)` is/are ambidentate ?

Ligands can be classified by various ways, based upon charges, denticity and interaction between ligand and central atom. Which of the following ligand is of ambidentate type ?

Which of the following ligands can act as ambidentate ligand ?

Which of the following is an example of ambidentate ligand

Which of the following ligands would act as flexidentate ligand and ambidentate ligand?

Which of the following is not an ambidentate ligand ?