History · Indus Valley Civilization

With reference to the seals of the Indus Valley Civilization, consider the following statements: I. Most Indus seals were crafted from steatite, which was often treated to achieve a glossy white surface before engraving. II. The use of seals was closely linked to long-distance trade and administrative control, rather than to personal ornamentation. III. The script engraved on Indus seals has been fully deciphered, enabling clear identification of the language used by the Harappans. IV. Some Indus seals depict composite or mythical animals, suggesting a symbolic or ritual dimension beyond purely economic functions. Which of the statements given above are correct?