Which nations are members of the BIMSTEC Initiative

Which of the following sets of nations are members of the BIMSTEC Initiative?

1. Bangladesh, Bhutan, Nepal, India and Sri Lanka
2. Bangladesh, Bhutan, Nepal, India, Sri Lanka, Thailand and Myanmar
3. Bangladesh, Bhutan, Nepal, India, Sri Lanka and Maldives
4. Bangladesh, Bhutan, Nepal, India, Myanmar, Sri Lanka and Indonesia