Explanation:

• A Stringency Index created by Oxford University shows how strict a country’s measures were responding to the Covid-19 outbreak, and at what stage of the spread it enforced these. It is among the metrics being used by the Oxford COVID-19 Government Response Tracker.
• It tracks 17 indicators of government response. These indicators examine containment policies such as school and workplace closings, public events, public transport, stay-at-home policies. The Stringency Index is a number from 0 to 100 that reflects these indicators. 
• A higher index score indicates a higher level of stringency. The Stringency Index has found that India indeed had one of the strongest lockdown measures in the world — at a 100 score since March 22. 
• It was relaxed slightly on April 20 after the government eased norms for certain workplaces in regions outside the red zones. In countries such as the UK, the US, and India, the Oxford graphs find that the death curve has not flattened after strictest measures were enforced. Hence all the statements are correct.