Describe the shapes of `BF_(3)` and `BH_(4)^(-)`. Assign the hybridisation of boron atom in these species.
A. `BF_(3)` - Trigonal, `sp^(2)` hybridisation,
`BH_(4)^(-)` - square planar, `sp^(3)` hybridisation
B. `BF_(3)`-Triangle, `sp^(3)` hybridisation,
`BH_(4)^(-)` - Hexagonal, `sp^(2)` d hybridisation
C. `BF_(3)` - Trigonal, `sp^(2)` hybridisation,
`BH_(4)^(-)` - Tetrahedral, `sp^(3)` hybridisation
D. `BF_(3)` - Tetrahedral, `sp^(3)` hybridisation
`BH_(4)^(-)`- Tetrahedral, `sp^(3)` hybridisation
