What Is the Difference Between "Hard Money" and "Soft Money

What is the difference between "hard money" and "soft money"?

A) Hard money is more difficult to acquire.
B) Hard money is specie like gold or silver, while soft money is paper.
C) Soft money is issued for only a specified number of months.
D) Hard money has no value, while soft money increases in value.
E) Soft money was usually easy to find, but only the elite had access to hard money.