History · Ancient Indian Architecture and Urban Planning

Consider the following statements about domestic architecture in the Harappan civilisation: I. The relative uniformity in the built form of houses has been cited by some scholars as one of the indicators of limited social differentiation. II. Habitation units in Harappan urban centres were generally laid out in a concentric or radial pattern around a central core. III. Elaborate drainage arrangements were a marked feature of major Harappan towns, but such arrangements were not entirely absent in smaller settlements. Which of the statements given above are not correct?