Why is computer fraud often much more difficult to detect than other types of fraud? 

A) because massive fraud can be committed in only seconds, leaving little-to-no evidence 

B) because most perpetrators invest their illegal income rather than spend it, concealing key evidence 

C) because most computer criminals are older and more cunning than perpetrators of other types of fraud 

D) because perpetrators usually only steal very small amounts of money at a time, requiring a long period of time to pass before discover