Which of the following are features of mass communication?

The features of mass communication are that it is public, rapid, and from a professional source.

Being public, statement 3, means the message is openly available to a large, anonymous and heterogeneous audience rather than kept private.

Being rapid, statement 4, reflects that mass media can reach vast numbers of people almost simultaneously across wide distances.

Coming from a professional source, statement 5, captures that messages are produced by organised institutions and trained communicators, not casual individuals.

Being face-to-face, statement 1, is wrong, since mass communication is mediated and distant, not a direct personal encounter.

Being private, statement 2, is also incorrect, because mass communication is by nature open and public, not confined to a private exchange.