23. Which of the following statements is true about the octahedral complexes of Ni2+? (A) Both strong- and weak-field complexes are paramagnetic. (B) The strong-field complex is paramagnetic and the weak-field complex is diamagnetic. (C) Both strong- and weak-field complexes are diamagnetic. (D) The strong-field complex is diamagnetic and the weak-field complex is paramagnetic. (E) none of these