One of Jerome's friends says, "I have noticed a lot of news stories about cybercrime lately. Why are computer incidents so prevalent?" Jerome explains that one reason is that

a$.$ many businesses have implemented BYOD pollies

b$.$ the computing environment is becoming less complex and less diverse

c$.$ computer troublemakers are more likely to work independently than in the past

d$.$ zero$-$day attacks have become more frequent than attacks exploiting known soltware vulnerabilities