How did the sumerians sign their names?

a.
with a carved seal

b.
with a fingerprint in clay

c.
with the dye from berries

d.
with the tip of a feather

A cylindrical seal is that Sumerians use to sign their names.  if important people didn't know how to write, then they would carry around a necklace with a seal that they'd put in ink and then shove it on a piece of paper.