What are the three key characteristics of social media as defined in chapter one? A. Flexibility, marketing, and content schedule B. Interactivity, openness and flexibility, and fast paced flows of information C. Fast-paced flows information, likeability, and consistency D. Interactivity, openness, and humor O a. Flexibility, marketing, and content schedule O b. Interactivity, openness and flexibility, and fast-paced flows of information O c. Fast-paced flows of information, likeability, and consistency O d. Interactivity, openness, and humor