Assertion: `SiF_(6)^(2-)` is known but `SiCl_(6)^(2-)` is not.
Reason: Size of fluorine is small and its lone pair of electrons intersects with d-orbitals of `Si` strongly.
A. Both A and R true and R is the correct explanation of A
B. Both A and R true and R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
