Assuming an octahedral geometry for the six-coordinate species and square planar geometry where stated, which statements about the number of geometrical isomers are correct? One or more options may be correct.

1. A$[\mathrm{Ma}{}_2\mathrm{b}{}_2\mathrm{c}{}_2]$ has 5 geometrical isomers.
2. B$[\mathrm{Ma}{}_3\mathrm{b}{}_3]$ has 2 geometrical isomers.
3. Csquare planar $[\mathrm{Mabcd}]$ has 3 geometrical isomers.
4. D$[\mathrm{M}(\mathrm{AA}){}_2\mathrm{b}{}_2]$ (AA symmetrical bidentate) has 3 geometrical isomers.