Explanation:

- Historically, the Indian rupee was primarily a silver coin during the time of standardization under the Mughal Empire and later the British Raj.

- ?? Correct Answer: Option 3 - Silver

- Copper coins were generally used for smaller denominations and everyday transactions.

- Gold coins were typically used for high-value transactions, similar to large denominations or savings.

- Bronze coins were not a primary material used for the Indian rupee; more common in modern coinage for smaller denominations.