Consider the following statements about the role of numismatics in medieval Indian history:

1. Coins are valuable sources for reconstructing economic history, trade patterns, and political authority.
2. The Rupiya, introduced by Sher Shah Suri, became the standard silver currency used for centuries.
3. Mughal coinage often had inscriptions in Persian and featured both religious and royal symbols.
4. Coins issued by South Indian rulers like the Cholas often depicted deities like Shiva and were inscribed in Sanskrit.

Which of the above statements are correct?