एक औपचारिक निमंत्रण मुख्य रूप से अपने किस गुण के कारण अनौपचारिक निमंत्रण से भिन्न होता है?

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?