Explanation:

* Union Defence Minister Rajnath Singh inaugurated the advanced Hypersonic Wind Tunnel (HWT) test facility during his visit to Defence Research and Development Organisation’s (DRDO’s) Dr APJ Abdul Kalam Missile Complex in Hyderabad.
* The state-of-the-art HWT Test facility is pressure vacuum driven enclosed free jet facility having nozzle exit diameter of 1 meter and will simulate Mach No 5 to 12 (Mach represents the multiplication factor to the speed of sound).
* After USA and Russia, India is the third country to have such a large facility in terms of size and operating capability. It is an indigenous development and an outcome of synergistic partnership with Indian industries.

option 3 is correct answer