Consultative style is the standard one, requiring professional or mutually acceptable language in situations like communication between teachers and students, employers and employees, doctor and patient, judge and lawyer, or President and his/her constituents.
Formal style is used in formal settings, unlike the consultative style, it is one-way, with examples including sermons by priests and ministers, State of the Nation Address of the President, formal speeches, or pronouncements by judges.
Frozen style is "frozen" in time and remains unchanged, mostly occurring in ceremonies, with common examples being the Preamble to the Constitution, Lord's Prayer, and Allegiance to country or flag.