The table below shows the total utility data for products $x$ and $Y.$ Assume that the prices of $x$ and $Y$ are $$3$ and $$4,$ respectively, and that consumer income is $$18.$ How many units of the two products will the consumer buy, to get maximum utility?

$\backslash$table$[[$Units of $x,$Total Utility $(x),$Units of $Y,$Total Utility $($Y$)],[1,9,1,16],[2,15,2,28],[3,19,3,36],[4,21,4,40],[5,22,5,42]]$

$2$ of $x$ and $3$ of $Y$

$2$ of $x$ and $2$ of $Y$

$1$ of $x$ and $4$ of $Y$

$3$ of $x$ and $4$ of $Y$