25. Which of the following statements is correct? (A)The low-spin Ru(NH3)6 2+ ion has 4 unpaired electrons.(B)The Ni(H2O)6 2+ ion has 0 unpaired electrons. (C)The diamagnetic PdCl4 2- ion has a tetrahedral d8 structure. (D) CN- is a weaker field ligand than SCN-1 because the Fe(CN)6 3- ion is paramagnetic with one unpaired electron and the Fe(SCN)6 3- ion has five unpaired electrons. (E)The F- ligand in the CrF6 4- ion produces a weak field because the ion is known to have four unpaired electrons.