Which of the following is correct regarding the bonding of ${\mathrm{Al}}_2{\left({\mathrm{CH}}_3\right)}_6$?

$22\left(2c-2e^{-}\right)$ bond and $2(3c-2e)$ bond

$4(2c-2e)$ bond and $2(3c-4e)$ bond

All central atom are having complete octet

Molecule is non-planer