Harappan cities were meticulously planned with two distinct areas, typically a citadel and a lower town (A). These cities also featured grid-pattern streets (B), a testament to the advanced urban planning of the Harappans. Contrary to the assumption in the options, Harappan cities had advanced drainage systems (E), and the Great Bath in Mohenjodaro was an important ritualistic feature (D). The idea that windows were at ground level is incorrect, as most Harappan buildings had windows higher up, possibly to protect against floods or invasions.