Which of the following is/are not true in respect of bricks used by people of Harappan culture?

Such bricks were used in only some of the Harappan settlements.

Despite not being produced in a single centre, Harappan bricks maintained a consistent ratio across the entire region, from Jammu to Gujarat.
Bricks used in the Harappan settlements, whether sun-dried or baked, including Mohenjodaro, were of standardized dimensions (generally 4:2:1).
The ratio of length to breadth was four times to twice the height.
Standardized bricks were utilized extensively in various structures throughout the Harappan civilization.