Which of the following are some distinctive features of Mohanjodaro?
1. It was a planned Urban city in which the lower town was also walled.
2. Grid pattern drainage system intersecting at right angles.
3. Every house had its own bathroom paved with bricks, with drains connected through the wall to the street drains.
4. Houses were a build-up to the ground floor as no remains of the staircase have been found.
1. 1, 2 and 3 only
2. 2, 3 and 4 only
3. 1, 3 and 4 only
4. 1, 2 and 4 only