The Fed Is Often Considered the Bankers' Bank Because It

The Fed is often considered the bankers' bank because it:

A) demands much more currency than it has available.
B) no longer has a monopoly on printing paper currency.
C) lowers the discount rate in order to restrict the money supply.
D) holds bankers reserves, provides banks with currency and loans, and clears their checks.
E) refuses to uses its power of open market operations when a quorum of state-chartered bankers petitions it.