Which of the following statements best describes the prevailing economic mechanism of Harappan external trade?

Options:

• A: A highly monetized system utilizing silver punch-marked coins for international transactions.
• B: A barter-based system supplemented by standardized weights, seals, and regulated exchange networks.
• C: A state-controlled monopoly where all trade was conducted solely by the ruling priests of temples.
• D: An informal, unregulated system of opportunistic exchange without standardized measures.

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