Choose the correct alternative and complete the statements.
(i) A rule that prescribes marriage within a group is called ……………….
(exogamy / endogamy / polygamy)
(ii) A family that comprises at least three generation is a ………………… family.
(nuclear / joint / cohabitation)
(iii) The 10 + 2 + 3 system is part of the ………………. system of education.
(informal / formal / universal)