What are the four basic characteristics of the balance sheet of the central bank? I - Issuer of paper currency (monetary base); II - Banker of the...

What are the four basic characteristics of the balance sheet of the central bank?

I - Issuer of paper currency (monetary base);
II - Banker of the National Treasury;
III - Banker of commercial banks (rediscount);
IV - Depository of international reserves.
a) Only I and II are correct.
b) Only II and III are correct.
c) Only III and IV are correct.
d) All are correct.