During chemistry class, a teacher wrote as a coordination complex ion on the board. The students…

During chemistry class, a teacher wrote $[\text{Ni}(\text{CN})_4]^{2-}$ as a coordination complex ion on the board. The students were asked to find out the magnetic behaviour and shape of the complex. Pari, a student, wrote the answer paramagnetic and tetrahedral whereas another student Suhail wrote diamagnetic and square planar. Evaluate Pari’s and Suhail’s responses.