\[{{[Ni{{(N{{H}_{3}})}_{6}}]}^{2+}}en\xrightarrow{{}}X+2N{{H}_{3}}\]\[[Ni{{\left( N{{H}_{3}} \right)}_{6}}]+2en\xrightarrow{{}}Y+4N{{H}_{3}}\]\[[Ni{{\left( N{{H}_{3}} \right)}_{6}}+3en\xrightarrow{{}}Z+6N{{H}_{3}}\]Which of them show optical as well as geometrical isomerism?

• A. X                                 
• B. Y
• C. Z                                 
• D. All of these