What is not true about money?

$$A$.$ Money is a medium of exchange, store of value and unit of account.

$$B$.$ Changing either the supply or demand for money changes its purchasing power.

$$C$.$ Money demand in the form of cash$-$balances is always unlimited.

$$D$.$ The Keynesian liquidity trap is based on infinite money demand.

of commercial banks and the behavior of the cash holding public.