`[Co(NH_(3))_(4)(NO_(2))_(2)]CI` exhibits
A. Ionization isomerism, geometrical isomerism and optical isomerism
B. Linkage isomerism, geometrical isomerism and optical isomerism
C. Linkage isomerism, ionization isomerism and optical isomerism
D. Linkage isomerism, ionization isomerism and geometrical isomerism