Hello there. Hope you are doing good. I would like to tell you that the specialization you want to choose depends completely on your interest. Since you are from Computer Science background, it is advisable to you to choose MBA IT as an option. It will help you in fetching better placement opportunities due to the technical skills you possess. However, if you want to switch completely from a Computer Science  field to a different field of specialization, then also there is no harm because at the end of the day what matters the most is your area of interest. So, I would suggest you to identify your interest on your own as no field is good or bad when it comes to MBA. Every field has ample amount of opportunities. You should just need to be a completely passionate about what you are doing.

I ope you found this answer helpful. Good luck for you future.