What is the accurate definition of the bubble-point line?

The answer options are:a) The line that shows when the liquid begins to boil / evaporateb)The vapour-liquid mixture regionc)Saturated vapour equilibri

The answer options are:
a) The line that shows when the liquid begins to boil / evaporate
b)The vapour-liquid mixture region
c)Saturated vapour equilibrium line
d)Saturated liquid equilibrium line
e)None of the above

or:The answer options are:a) The line that shows when the liquid begins to boil / evaporateb)The vapour-liquid mixture regionc)Saturated vapour equilibrium lined)Saturated liquid equilibrium linee)None of the above


or:it's not called a bubble point line its called a bubble point curve and that is when bubble point is when a liquid forms the first bubble of vapor and begins to evaporate.

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