Feed solution $\textbf{F}$ is contacted with solvent $\textbf{B}$ in an extraction process. Carrier liquid in the feed if $\textbf{A}$ and the solute is $\textbf{C}$. The ternary diagram depicting a single ideal stage extraction is given below. The dashed lines represent the tie-lines.

The $\text{CORRECT}$ option(s) is/are

1. For the tie-lines shown, concentration of solute in the extract is higher than that in the raffinate
2. Maximum amount of solvent is required if the mixture composition is at $W$
3. $Y$ represents the composition of extract when minimum amount of solvent is used
4. $U$ represents the raffinate composition if the mixture composition is at $M$
in Others
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