What is the correct advice to follow when using texting or instant messaging $($IM$)$ in the workplace?

Question $17$ options:

a$)$

Feel free to send sensitive or confidential messages to people you know.

b$)$

Check with your supervisor to learn about your organization's messaging policies.

c$)$

Keep a single contact list of personal and professional contacts for efficiency.

d$)$

Even if you are completing a project or trying to meet a deadline, answer all texts or instant messages immediately.