Which of the following complex has 2.82 BM Spin only magnetic moment.

Option 1….n=5…5.9 B.M;Option 3….n=1…1.732 B.M;Option 4….n=4…4.9 B.M;Option 2…n=2…2.82 B.M;The metal ion is Mn+3d4, since the ligand is strong, hence partial pairing of electrons occurs and after pairing two unpaired electrons are presents