What Advantage Does Instant Messaging Have Over Phone and Conference

Multiple Choice

What advantage does instant messaging have over phone and conference calls?

A) It is more informal and saves time by reducing social courtesies during interactions.
B) It offers users a greater sense of telepresence than phones or conference calls do.
C) It is more personal than phone calls and conference calls and offers greater media richness.
D) It is a collaborative technology that allows a number of people to participate at the same time.