Need to decide topic of dissertation Mtech Computer Science

Help me to decide the topic of my dissertation for mtech(Computer Science)
Anything in the domain of:
Software testing
Web Information retrieval
Artificial Intelligence
Computer organization

The topic of your dissertation will determine what your life is going to look like for the next months and years, so you must choose wisely. Here are some questions I have for you:

In which of these areas have you already done research?
In which of these areas are you especially well-read already?
In which of these areas are you most interested?
In which of these areas do you hope to work or teach in the future?
What are the requirements of your program concerning the dissertation?
Is there an ongoing research project at your institution that you could join in order to obtain data in exchange for your labor on the collective project?
What is the area of expertise of your faculty adviser?

This would seem to be the most important one, since you seem to already have made it into your program. What do you want to work on, bearing in mind that this is likely the final step in your transition from student to professional?