Which of the following helps us to get information about the Harappan civilization?

Archaeological sources

The Harappan seal is possibly the most distinctive artefact of the Harappan or Indus Valley civilization. Made of a stone called steatite, seals like this one often contains animal motifs and signs from a script that remains undeciphered. Yet we know a great deal about the lives of the people who lived in the region from what they left behind – their houses, pots, ornaments, tools, and seals – in other words, from archaeological evidence.