India is a member of the East Asia Summit (EAS).
The East Asia Summit is a forum that includes the ten member countries of the Association of Southeast Asian Nations (ASEAN) along with eight other countries, including India. The EAS provides a platform for discussions on various political, economic, and security issues in the East Asia region. India has been a member of the EAS since its inception in 2005.
Therefore, the correct answer is "3 only." India is a member of the East Asia Summit.