According to the phase diagram given, which of the following statements is INCORRECT?

◦ At the temperature and pressure of point 2, substance Z exists as a three-phase equilibrium system.
◦ At the temperature and pressure of point 3, substance Z exists as a one-phase gaseous system.
◦ If the Z(s) = Z(l) = Z(g) system is maintained at the temperature of point 2 while pressure is decreased, more Z will vaporize.
◦ If liquid Z is maintained at the pressure of point 4 while the temperature is decreased to 30 °C, the liquid will vaporize.
◦ The existence of liquid Z at -50 °C and 2 atm represents the metastable condition of "supercooling."