code class$=$"asciimath"$>$Which of the differential equations below i$($s$)/($a$)$re separable? Choose all that apply. The following checkbox options contain math elements, so you may need to read them in your screen reader's $$reading$$ or $$browse$$ mode instead of $$forms$$ or $$focus$$ mode. Choice $1$ of $5$:A$.$ y$=$xy$+$yy$=$xy$+$y Choice $2$ of $5$:B$.$ y$=$xy$+$xy$=$xy$+$x Choice $3$ of $5$:C$.$ y$=$xy$+$x$+$yy$=$xy$+$x$+$y Choice $4$ of $5$:D$.$ xy$=5$x$+$yxy$=5$x$+$y Choice $5$ of $5$:E$.$ None of the above