निम्नलिखित में से कौन सा संगठन नियमित रूप से राजस्थान में भारत-पाक सीमा पर 'ऑपरेशन सर्द हवा' नामक शीतकालीन सीमा गश्त अभ्यास आयोजित करता है?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?