The correct option is 2 and 3 only because the Changpa community primarily inhabits the Changthang region of Ladakh, not Uttarakhand, which makes the first statement incorrect. They are renowned for herding Pashmina goats, which produce fine, sought-after wool, confirming statement 2. Furthermore, the Changpa are recognized as a Scheduled Tribe in India, which aligns with statement 3. This understanding highlights the community's unique cultural practices related to livestock herding and their socio-economic status within the Indian demographic framework, relevant for UPSC Prelims in addressing questions on indigenous communities and their classifications.