The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in `[B(OH_(4))]^(-)` and the geometry of the complex are respectively.
A. `sp^(3)`, tetrahedral
B. `sp^(3)`,squre plannar
C. `sp^(3)`d^(2),octahedral
D. `dsp^(2)`,square planar
