4. New deposits have increased at financial institutions by $1 billion through the Fed's open market operations. If the reserve requirement for all deposits is 10%, what is the maximum change in money supply the Fed's action can have on total loanable funds? Select one: a. $9 billion increase b. Total deposits would decrease, but there is not enough information to compute the amount c. An increase greater than $1 billion d. $11 billion increase e. $900 million increase