Solution:The Indo-Tibetan Border Police (ITBP) is one of the five Central Armed Police Forces of India. It was raised on 24th October, 1962, under the CRPF Act, in the wake of the Sino-Indian War of 1962.
The ITBP was intended for deployment along India’s border with China’s-Tibet Autonomous Region. In 2004-05, it replaced the Assam Rifles on the Indo-China border in Sikkim and Arunachal Pradesh under the concept of ‘One Force, One Border’.
The ITBP, was started with 4 battalions. Since 1978, it has undergone expansion to a force of 56 battalions. As of 2017 , it has sanctioned strength of 89,432 personnels. Hence, statements 1, 2, 3 are correct and statement 4 is incorrect.