Which of the Following Can Be Considered as a Netiquette

Multiple Choice

Which of the following can be considered as a netiquette?

A) Using all-capitals to emphasize the subject line.
B) Sending cards,rather than emails,to express appreciation for hospitality.
C) Sending people messages containing all the information you think is necessary.
D) Sending angry messages by email in order to restrict face-to-face conflicts.