Porter's company has decided to let employees use instant messaging (IM) as an internal communication tool, and she wants to make sure that she's using it professionally. What should she do? A、 Make sure she's available via IM at all times so that her colleagues can always reach her. B、 Include both professional and personal contacts on the same IM contact list for efficiency. C、 Respect her receivers by using proper grammar, spelling, and proofreading in her instant messages. D、 Create an imaginative IM name for herself such as "PrettySmart1."