Which of the following attributes were not common of Indus Valley stamp seals? a. The stamps were carved out pure limestone. b. They were used as marks of ownership/status. d. The stamps contain inscriptions along the top edge.

The first sentence is false! (a. The stamps were carved out pure limestone.)

The stamps were actually made mostly of another kind of rock: stearite (a magnesium-rich rock composed of mineral talc.

Some of them are also made of silver or calcite or faience (fine pottery)