Question

respond quickly
keep your message short
sign out if you are in a meeting or are not able to respond
dont say anything that you would not say to the other persons face
avoid chatting with your friends during work

1. these are all rules for

critical thinking
instant messaging
cell phone use
none of the above
save and quit... settings

Explanation:

The rules (respond quickly, short messages, sign out when unavailable, appropriate communication, avoiding personal chats at work) align with guidelines for real-time text-based communication platforms, which is instant messaging. Critical thinking rules focus on analysis, cell phone use rules cover hardware-specific behaviors (e.g., charging, storage), so neither fits.

Answer:

instant messaging