Explanation:

The five-nation grouping BRICS has adopted a new counter-terrorism strategy to effectively deal with terrorism. The objective of BRICS counter-terrorism cooperation is to complement and strengthen the existing bilateral and multilateral ties among the BRICS countries, and to make a meaningful contribution to the global efforts of preventing and combating the threat of terrorism.

• BRICS is the acronym coined to associate five major emerging national economies: Brazil, Russia, India, China, and South Africa.
• Mekong Ganga Cooperation: It comprises six member countries, namely India, Thailand, Myanmar, Cambodia, Laos and Vietnam.
• Shanghai Cooperation: It comprises of 8 Member States, namely China, India, Kazakhstan Kyrgyzstan, Russia, Pakistan, Tajikistan and Uzbekistan.
• The Asia-Pacific Economic Cooperation is an inter-governmental forum for 21 member economies in the Pacific Rim that promotes free trade throughout the Asia-Pacific region. It comprises of  Australia · Brunei · Canada · Chile · Hong Kong · Indonesia · Japan · Malaysia · Mexico · New Zealand · Papua New Guinea · Peru · People's Republic of China · Philippines · Republic of China (Taiwan ).

Hence option 2nd is correct.