Which of the following Sultan of Delhi assumed the title of 'Sikander Second' (Sani)?

Alauddin Khilji, the highly ambitious ruler of the Khilji Dynasty who controlled the Delhi Sultanate, assumed the proud title Sikandar-i-Sani (which translates to 'The Second Alexander'). He even had this title stamped onto his official coinage to reflect his aspirations for global conquests and territorial expansions across the Indian subcontinent.