Computers & IT (Non-Engg)

If you belong to the technology field, then cloud computing, but if you want to move to the management role or want inner depth knowledge of business to business perspective, go for BA (business analytics). Although, IBM has its own proprietary products in software, hardware, and servers. Inside IBM, you will be given n number of opportunities to go for the big amount of certifications and band levels which are highly in demand in corporate levels. Business analyst's role is higher than that of solution manager or SPM's. It requires much experience level to reach that position. Thus, BA certification is much better for the long run.
All the best.

Master of Science in computer science
Master of Computer Applications
MBA
PGDCA (Post Graduate Diploma in Computer Applications)
The first option is naturally the next step. As you have a Bachelors in CS, it would make sense for you to pursue a Master's Degree in the same subject. Mumbai University offers lots of choices in terms of courses. There's a good variety in elective as well as core papers.
Your next choice should be DU (it isn't that hard to get into the Master's program. Also, the entrance test carries a sizeable weightage. And after that, you can do research yourself.
You can do MCA. Having done your B.Sc in CS, MCA course might seem redundant to you. But MCA is valued in the industry and gets you good jobs. So, you will want to persist with it.
You can always do MBA. Start preparing for CAT, MAT or XAT right now. The test is not easy and requires a lot of preparation. You need to work very hard to get into a B-School. But if you can get into IIM, your prospects will be good.
PGDCA is a Diploma course. It might help you if you have a Master's Degree in any other subject.