How does currency contribute to the money supply? (1 mark)

a.Currency held by the public and by banks is part of the money supply.

b.Currency held by the public is part of the money supply, but currency held by banks is not.

c.Currency held by the public is not part of the money supply, but currency held by banks is.

d.Currency held by the public or banks is not part of the money supply since it is not included in M1.