Which definition(s) of the money supply include(s) only items which are directly and immediately usable as a medium of exchange?

Question

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M1 includes currency, demand deposits, and traveler's checks, which are all directly and immediately usable as a medium of exchange. M2 includes additional items, such as savings deposits and small time deposits, which may not be as immediately usable and can take some time to convert into currency.

Which Definition(s) of the Money Supply Include(s) Only Items Which