Which one of the following is an inner orbital complex as well as diamagnetic in nature?

In ZNNH362+, Zn exists as Zn2+ 30Zn:3d10,4s2Zn2+: 3d10 ; Thus, no unpaired electron but it is outer orbital complex.In [Co(NH3)6]3+, Co exists as Co3+27Co: 3d7, 4s2Co3+: 3d6; It is d2sp3 hybridized, inner orbital complex with 3 electron paired in 3d.