In octahedral complex $M{a}_2{b}_{2}cd$ total number of steroisomers is

Here, the stereoisomers can be,

$\left(aa\right)\left(bb\right)\left(cd\right)$

$\left(ab\right)\left(ab\right)\left(cd\right)$

$\text{ (ac) (bb) (ad) }$

$\left(aa\right)\left(bc\right)\left(bd\right)$

$\text{ (ac) }\left(ab\right)\left(bd\right)$ optically active
$\left(ad\right)\left(ab\right)\left(bc\right)$ optically active

Hence correct answer is 0008.