Explanation:

- The Hemis Tsechu festival is a significant cultural and religious event celebrated in the Hemis Monastery in Ladakh, India.

- Correct Answer: Option 2 - Guru Padmasambhava

- The festival commemorates the birth anniversary of Guru Padmasambhava, also known as Guru Rinpoche, who is credited with spreading Tantric Buddhism in Tibet.

- Option 1: Adi Shankaracharya

- A philosopher and theologian who consolidated the doctrine of Advaita Vedanta, but not related to Hemis Tsechu.

- Option 3: Dalai Lama

- The spiritual leader of Tibetan Buddhism, but the festival is not specifically associated with the Dalai Lama.

- Option 4: Gautama Buddha

- The founder of Buddhism, but the Hemis Tsechu does not commemorate his birth anniversary directly.