Terracotta models of the plough have been discovered at multiple Harappan sites, including Cholistan, and Banawali. These models suggest the significance of agriculture and ploughing practices in the Harappan civilization.Representations on seals and terracotta sculpture indicate that the bull was known, and archaeologists extrapolate from this that oxen were used for ploughing. Moreover, terracotta models of the plough have been found at sites in Cholistan and at Banawali (Haryana).

So, the correct option is [4].