Why were the punch-marked coins named so?

The symbols of a punch were marked on the coin. Five types (Panch) of symbols were drawn on the coins The symbols on the coin were punched or stamped onto the metal surface. None of the above

The symbols on the coin were punched or stamped onto the metal surface.

A punch-marked coin was named so because the symbols on the coin were punched or stamped onto the metal surface.