The hybridisation, shape and oxidation number of Ni in the organometallic complex Ni(CO)4 are respectively.
(1) dsp 2, square planar, +2, paramagnetic
(2) dsp3, square planar, +2, diamagnetic
(3) sp3, tetrahedral, 0, diamagnetic
(4) sp 3, tetrahedral, +2, paramagnetic