Which of the Following Is Correct Regarding Ecash

Which of the following is correct regarding ecash?

A) It is part of the established network of banks,cheques,and paper currency.
B) Ecash transactions are more expensive than handling cheques and paper records.
C) Ecash can be lost if the issuer's computer system crashes and the money that is "banked" in memory is lost.
D) Tight controls over ecash have been established to prevent hackers from stealing the money.
E) Ecash can be purchased only from banks.