Which innovative feature of Mesopotamian cylinder seals made them function similarly to modern corporate logos in product authentication?

Before modern logos and branding, ancient civilizations had their own ways of marking products and establishing identity. The Mesopotamians developed an intricate system of cylinder seals and stamp seals that served as early product branding tools. These seals identified ownership, authorized transactions, and distinguished products in marketplaces across the ancient world. Test your knowledge about these fascinating early branding devices that influenced commerce for thousands of years!

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They contained uniquely carved imagery that created a distinct impression when rolled on clay, allowing instant recognition of the merchant or workshop
They were made of precious metals that could only be afforded by official government entities
They incorporated a hieroglyphic writing system that could be read by all citizens across different city-states
They changed color when exposed to sunlight, providing a verification method against counterfeits in marketplace transactions