If You Receive an Email That Says It Is from Sam

Multiple Choice

If you receive an email that says it is from Sam Johnson, your boss, with an odd EXE file as an attachment, it could be dangerous for all of the following reasons except:

A) It could be dangerous because the email might not really be from Sam.
B) It could be dangerous because the email might be from Sam's computer without his or her knowledge.
C) It could be dangerous even if it was sent knowingly because Sam didn't know a virus might be attached.
D) It could be dangerous because Sam gave someone his password once a long time ago
E) None of the above (indicating that all are true) .