Which of the following statements are correct regarding Himalayan Mountain range? 1. The Shiwalik formations are absent in Arunachal Himalayas. 2. Dun formations is a feature of Sikkim Himalayas. 3. Bugyals are summer grasslands in the Himalayan region of Uttarakhand. Select the correct answer using the code given below:

Statement 1 is correct. The Himalayas in Arunachal and Sikkim are characterized by the absence of the Shiwalik formations, unlike other sections of Himalayas. Instead of this, duar formations are found here. They are used extensively for tea plantation. Statement 2 is incorrect. Duar formations is a feature of Sikkim Himalayas. In Uttarakhand, there are Dun formations. Duns are longitudinal valleys formed as a result of folding when Eurasian plate and Indian plate collided. They are formed between Lesser Himalayas and Shiwaliks. Statement 3 is correct. Bugyals are summer grasslands in the higher reaches of the Great Himalayas in the Uttarakhand region. The nomadic groups like Bhotiyas, migrate to Bugyals during summer months and return to valleys during winters.