The correct answer is option 3, India. ASEAN, also known as the Association of Southeast Asian Nations, is a regional organization consisting of ten member countries in Southeast Asia. These member countries are Brunei Darussalam, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, and Vietnam.

Option 1, Brunei Darussalam, is a member of ASEAN. It is a sovereign state located on the north coast of the island of Borneo in Southeast Asia.

Option 2, Cambodia, is also a member of ASEAN. It is a country located in the southern portion of the Indochinese Peninsula in Southeast Asia.

Option 4, Vietnam, is a member of ASEAN. It is a country located on the eastern Indochinese Peninsula.

However, option 3, India, is not a member of ASEAN. India is a neighboring country to Southeast Asia but it is not part of the ASEAN organization. India has its own regional organization called SAARC (South Asian Association for Regional Cooperation), which consists of eight member countries in South Asia.

Therefore, the correct answer is option 3, India.