all the following are different forms of money except

The correct option is "bank sellers" because it is not a form of money. Bank notes, demand deposits, coins, and currency are all forms of money that can be used for transactions. Bank notes are physical currency issued by a central bank, while demand deposits are funds held in a checking account that can be easily accessed. Coins are small pieces of physical currency that are used for smaller transactions. Currency refers to any form of money that is widely accepted as a medium of exchange, including bank notes and coins. On the other hand, bank sellers are not a form of money, but rather individuals or institutions that sell financial products or services such as stocks, bonds, or insurance.