Multiple choice: Select all true statement(s)

(2) Which of following statement is correct (A) Three-phase equilibrium in a ternary system exists at a fixed temperature and pressure (B) Three-phase equilibrium in a ternary system exists at a fixed pressure and certain range of temperature (C) Three-phase equilibrium in a ternary system exists at a particular temperature (D) A ternary phase diagram (triangle) is equilateral (E) A ternary phase diagram (triangle) is plotted at a fixed pressure and temperature (F) A ternary phase diagram (triangle) is plotted at a fixed pressure and certain range of temperature