Explanation:

- Ho: The Ho people, an indigenous community primarily found in India, are known to practice marriage by intrusion. This type of marriage involves a partner entering the household uninvited and the relationship being later accepted by the family.

- Birhors: The Birhor community, mostly residing in parts of Jharkhand, also practices marriage by intrusion. This is a customary marriage form for certain tribes in India.

- Gond: Gonds are one of the largest tribal groups in India. They practice various forms of customary marriages, including marriage by intrusion.

- Oraons: The Oraon tribe, also known as Kurukh, inhabits the Chota Nagpur Plateau. They, too, are known to accept marriage by intrusion as a legitimate form of union.

Correct Answer: Option 4 - All of the above