At which of the following locations has a massive, 1,800-year-old living colony of the “Potato Patch” coral species ‘Pavona clavus’ been discovered?

In which of the following states did Tata and Airbus conduct the first test flight of the first ‘Made in India’ C295 aircraft? 

Who launched the recently discussed ‘Operation Milap’, under which separated individuals were reunited with their families? 

For which state, in addition to Jharkhand, has the Ministry of Defence approved the creation of an independent NCC State Directorate?  

On which of the following days is International Archives Day celebrated every year?