The correct option(s) regarding the complex ${\left[\mathrm{Co}\left(\mathrm{en}\right){\left({\mathrm{NH}}_3\right)}_3\left({\mathrm{H}}_2\mathrm{O}\right)\right]}^{3+}$

(en = ${\mathrm{H}}_2{\mathrm{NCH}}_2{\mathrm{CH}}_2{\mathrm{NH}}_2$ ) is (are)

A) ${\left[\mathrm{Co}\right(\mathrm{en}\left){\left({\mathrm{NH}}_3\right)}_3\right({\mathrm{H}}_2\mathrm{O}\left)\right]}^{+3}$ complex is type of [M(AA)${\mathrm{b}}_3\mathrm{c}$] have two Geometrical isomers.

B) If (en) is replaced by two cyanide ligand, complex will be type of [${\mathrm{Ma}}_3{\mathrm{b}}_2\mathrm{c}$] and have 3 G.I.

C) [Co(en)${\left({\mathrm{NH}}_3\right)}_3\left({\mathrm{H}}_2\mathrm{O}\right){]}^{3+}$ have d6 configuration ($\mathrm{t}{{ }^6}_{2\mathrm{g}}$) on central metal with SFL therefore it is diamagnetic in nature.

D) Complex [Co(en)${\left({\mathrm{NH}}_3\right)}_3\left({\mathrm{H}}_2\mathrm{O}\right){]}^{3+}$ have lesser CFSE ( O) value than $\left[\mathrm{Co}\right(\mathrm{en}){\left({\mathrm{NH}}_3\right)}_4{]}^{3+}$ therefore complex ${\left[\mathrm{Co}\right(\mathrm{en}\left){\left({\mathrm{NH}}_3\right)}_3\right({\mathrm{H}}_2\mathrm{O}\left)\right]}^{+}$ absorbs longer wavelength for d–d transition.