किस दीवान को उनके दयालु और सहानुभूतिपूर्ण रवैये के कारण सिखों द्वारा 'मीठा मल' उपनाम दिया गया था?

Who among the following Sikh Gurus founded the town and community at Kiratpur Sahib?

Which Sikh Guru is credited with standardizing the script of Punjab into the Gurmukhi script?

In which year was Guru Nanak Dev Ji's 550th birth anniversary (Parkash Purab) celebrated?