Consider the following statements about the Northeast hills: (1) Mawlynnong village is located in the West Khasi Hills of Meghalaya. (2) Living root bridges in Mawlynnong are built by cutting and shaping roots. (3) The Garo, Khasi, and Jaintia hills are part of the Meghalaya Plateau. (4) The Shad Suk Mynsiem festival expresses gratitude toward nature. Which of the above statements are correct?