Which is true for the complex `[Ni(en)_2]^(2+)` ?
A. paramagnetic , `dsp^(2)` , square planar , Cn of Ni = 2
B. diamagnetic , `dsp^(2)` , square planar , CN of Ni = 4
C. diamagnetic , `sp^(3)` , tetrahedral , CN of Ni = 4
D. paramagnetic , `sp^(3)` , square planar , CN of Ni = 4
