Which of the following definitions best describes the term "critical point"?A. The temperature and pressure at which all three phases of a substance coexist. Under these conditions, freezing and melting, boiling and liquefaction, and sublimation and deposition all proceed at the same rate. B. Pressure and temperature values on a phase diagram where two phases of a substance coexist. C. A specific temperature and pressure at which the liquid and gas phases of a substance have the same density and are indistinguishable from each other. D. In equilibrium with the liquid phase, the pressure exerted by a gas. E. A substance at conditions above its critical temperature and pressure, where the liquid and vapor phases are indistinguishable and have some characteristics of both a liquid and a gas.