Which of These Statements Represents Proper Email Etiquette Associated with the "Message

Multiple Choice

Which of these statements represents proper email etiquette associated with the "message body" of an email?

A) convey information concisely
B) use all capital letters to emphasize importance
C) be completely informal to appear friendly
D) as long as possible to provide complete details on you, your company, and product
E) all of these choices are correct