What do archaeologists believe was the function of signature seals?

Responses

They indicated ownership of bags of grain or cotton.
They indicated ownership of bags of grain or cotton.

They were payment for sending clay tablets to distant villages.
They were payment for sending clay tablets to distant villages.

They served as the centerpiece of ornamental clay platters.
They served as the centerpiece of ornamental clay platters.

Tax officials used them as receipts for payment of taxes.

Tax officials used them as receipts for payment of taxes.