With reference to the domestic architecture of the Harappan Civilization, consider the following statements:
1. The ruins of stairs are proof that some structures and buildings are multi-storey.
2. The Harappans were worried about their privacy as the walls along the ground level don't have any windows.
3. At Lothal while houses were built of mud bricks, drains were made of burnt bricks.
Which of the statements given above is/are correct?1
1 and 2 only
2
1 and 3 only
3
2 and 3 only
4
1, 2, and 3