i am not expert in this topic
however.. 1st of all see your interest... 2ndly see in which field (or company or organization) you may get job.. in other words where you have some source "safarash" which may help you in getting job.... very frankly yahan 99% jobs reference and safarash wagera se hi milti hain ...
among three options u mentioned... see the 2nd and 3rd ... my personal preference is IT... however.. besides your study to get certified in MCSC and CCNA or study MCSE and get CCNA certification at least.. and get practical grip on both these courses.. they will help you in getting job
if you are more interested in programming and web developing , etc........... then computer science is better