Please answe quick

Choose the example below that best demonstrates the "richest" channel of communication (in contrast to the "leanest"), e.g. the channel provides the most information and interactivity between sender and receiver: 0 a) Colleagues taking part in a department meeting via Zoom (video chat) with webcams and microphones. O b) An online Wiki easily changed and updated by anonymous posters. O c) There is no such thing as "richness" when choosing a channel of communication. {3 Q d) A memo distributed to all staff about new health and safety policies