Which of the Following Indicates Poor Etiquette on the Part

Multiple Choice

Which of the following indicates poor etiquette on the part of the sender?

A) Multitasking while using IM or other tools
B) Clearly indicating opinion so it doesn't appear as fact
C) Asking if this is a good time for an IM chat
D) Starting a new message for a new topic
E) Not using "reply all" when responding to communications