Which of the following plots represents the behavior of an ideal binary liquid solution ?

Which of the following plots represents the behaviour of an ideal binary liquid solution ?

Which of the following plots does not represent the behaviour of an ideal binary liquid solution?

For an ideal binary liquid system:

A binary liquid solution of n-heptane and ethyl alcohol is prepared which of the following statements correctly represents the behaviour of this liquid solution?

A binary liquid solution of n-heptane and ethyl alcohol is prepared . Which of the following ststements correctly represents the behaviour of this liquid solution ?