Explanation:

- The Khasi tribes of Meghalaya follow a matrilineal system.

- In a matrilineal society (Option 1 ), lineage and inheritance are traced through the mother's line. Property and family name pass from mother to daughter.

- Patrilineal (Option 2) refers to systems where descent is traced through the father’s line.

- Bi-lineal (Option 3) means both mother’s and father’s lines are considered for inheritance and descent.

- Cognatic (Option 4) allows inheritance and lineage to be traced through either or both parents, but not as structured as matrilineal or patrilineal systems.

- The Khasi, along with the Garos and Jaintias in Meghalaya, are among the rare groups in the world who are traditionally matrilineal.