Select the correct statement for $\left[\mathrm{M}\right(\mathrm{AB}\left){\mathrm{b}}_2\mathrm{cd}\right]$

It has four trans isomer with respect to $\text{'}\mathrm{b}\text{'}$

It has seven geometrical isomers.

It has four cis and two trans isomers with respect to$\text{'}\mathrm{b}\text{'}$.

All geometric isomers are optically active,