Who amongst the following Sultans of the slave dynasty reigned for the longest period ?

A.  qutub-ud-Din aibak

B.  Ghiyas-ud-Din Balban

C.  Nasir-ud-Din Mahmood

D.  Shams-ud-din iltutmish

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Which Province of Pakistan is called Bab-ul-Islam_____?

A Balochistan B Punjab C Sindh D K.P.K