Which of the Following Statements Is True About Worms

Which of the following statements is true about worms?

A) They abuse email systems to send unsolicited email to large numbers of people.
B) They allow hackers to destroy hard drives,corrupt files,and steal passwords by recording keystrokes and transmitting them to a server operated by a third party.
C) They insert unwanted words,numbers,or phrases into documents or alter command functions in an infected document.
D) They propagate without human intervention,often sending copies of themselves to other computers by email.