for attempting a question,one has to bit tricky. Outline all figures ,if it is asked who laid the foundation of ghaznavid dynasty.just point the date of invasion and analyse the statment relative it. Iltutmish is founder of slave dynasty. Why? Formation of band of forty is one factor, mangol policy other, rivalaries third factor, and consolidation the fourth one..
E.g m.b.qasim ka question.
Totally opinion base. I pointed hujaj bin yusaf ambition w.r.t to qasim,qatiba,musa bin nasir and tariq bin ziyaad.mohmmed bin qasim was for runner of mahmud . Bla bla