For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements:
(I) both the complexes can be high spin.
(II) Ni(II) complexes can very rarely be low spin.
(III) with strong field ligands, Mn(II) complexes can be low spin.
(IV) the aqueous solution of Mn(II) ions is yellow in colour.
The correct statements are: