The correct option is A India and Mongolia
The 11th Indo-Mongolia joint training Exercise, titled ‘Nomadic Elephant - 2016’ commenced on 25 April 2016 in Mongolia. The exercise aims at promoting military associations between India and Mongolia will culminate on 8 May 2016. The aim of this exercise is to develop synergy and inter operability between the two armies to fight in Counter Insurgency and Counter Terrorism environment under the United Nation mandate. Nomadic Elephant In the year 2004, for the first time, joint military training exercise Nomadic Elephant was organized, which has been organized regularly since last few years