Using the gibb's phase rule, determine which of the following systems is over-specified. in other words, which system and less than zero degrees of freedom? (a) 2 components in vapor-liquid equilibrium, both temperature and pressure are specified. (b) 1 component in three phases: solid, liquid, and gas. (c) 2 solids in equilibrium at a specified temperature. (d) 2 components as solid and liquid, with temperature, pressure, and mole fractions specified. (e) 1 component as a gas, temperature and volume specified.