`SiF_(6)^(2-)` exist but not `CF_(6)^(2-)` explain why ?

Assertion SiF_(6)^(2-) anion exists but CF_(6)^(2-) does not Reasoning Si atom vacnat d-orbital while C-atom has not .

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.

Statement-I: SiF_(6)^(-2) is known but SiCl_(6)^(-2) in not known Statement-II: Interaction of 'F' lone pair electrons with 'Si' is stronger than that of chlorine and due to smaller size of 'F' steric repulsion will bel less.

[SiF_(6)]^(2-) is known whereas [SiC_(6)]^(2-) not. The main reason is/are I Six large chloride ions cannot be accommodated around Si^(4+) due to limitation of its size. II. Interaction between lone pair of chloride ion and Si^(4+) is not very strong. Choose the correct option.