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