Explanation:

- Option 1: Central Reserve Police Force (CRPF):

- The CRPF is under the Ministry of Home Affairs.

- It handles law and order, counter-insurgency, and social welfare missions.

- Option 2: Assam Rifles:

- The Assam Rifles is the only paramilitary force with a dual control structure.

- It is administratively controlled by the Ministry of Home Affairs.

- Its operational control is under the Indian Army, making it unique.

- Option 3: Indo-Tibetan Border Police (ITBP):

- The ITBP is under the Ministry of Home Affairs.

- It focuses on guarding the Indo-China border.

- Option 4: Central Industrial Security Force (CISF):

- The CISF is governed by the Ministry of Home Affairs.

- It provides security to various industrial sectors and infrastructure.