Given below are two statements: Statement I : [$Co(NH_3)_6$ $]^{3+}$ is a homoleptic complex where as $[Co(NH_{3})_{4}Cl_{2} ]^+$ is heteroleptic complex. Statement II : complex [$Co(NH_3)_6$ $]^{3+}$ has one kind of ligands but $[Co(NH_{3})_{4}Cl_{2} ]^+$ has more than one kind of ligands. In the light of the above statements, choose the correct answer from the options given below: