With the creation of the Federal Deposit Insurance Corporation

With the creation of the Federal Deposit Insurance Corporation
A) member banks of the Federal Reserve System were required to purchase FDIC insurance for their depositors, while non-member commercial banks could choose to buy deposit insurance.
B) member banks of the Federal Reserve System were given the option to purchase FDIC insurance for their depositors, while non-member commercial banks were required to buy deposit insurance.
C) both member and non-member banks of the Federal Reserve System could choose, but were not required, to purchase FDIC insurance for their depositors.
D) both member and non-member banks of the Federal Reserve System were required to purchase FDIC insurance for their depositors.