What distinguishes Dholavira and Lothal from other Harappan settlements?

1) Absence of fortifications
2) Uniformity in architectural design
3) Entire settlement fortified and internal sections separated by walls
4) Citadel built at a lower height

Choose the correct answer from the given options:

3

Although the majority of Harappan settlements exhibit a common layout with a smaller elevated western part and a larger lower eastern section, there exist variations in some sites. Dholavira and Lothal, located in Gujarat, stand out as examples where the entire settlements were fortified, and additional walls separated different sections within the towns. While the Citadel in Lothal was not enclosed by walls, it was constructed at an elevated height.