Trending @Infosys; 1Yr Sabbatical / 2Yrs Higher Education Support - Leave at Infosys

1. what is the criteria/eligibility to take these leaves at infosys ?
2. After coming back do we need to work at infosys with any minimum duration / it's okay if we resign soon after returning ?
3. can we avail sabbatical leave for any personal reasons ?
4. are there any network colleges associated with Infosys, such that if we want to take 2yrs Higher education support leave - we have to study in that colleges only ---- anything like that ?

---- can somebody provide me with full details ----