Consider the following statements with regard to bead production in Harappan towns: I. The materials used to make beads included carnelian, quartz and steatite. II. The beads were cylindrical, barrel-shaped and disc-shaped. III. Specialized stone drills were used for making holes through the beads. Which of the statements given above is/are correct?

All three statements are correct. Harappan bead-makers used a wide variety of materials including carnelian (reddish), quartz, steatite, agate, jasper, lapis lazuli, gold, copper, and shell. Beads came in various shapes — cylindrical, barrel-shaped, disc-shaped, spherical, and segmented. Specialized stone drills, particularly cylindrical drills with hard stone bits, were used to bore holes through the beads, demonstrating advanced craftsmanship of the Harappan civilization, especially at sites like Chanhudaro and Lothal.