There is an example of Euler's method for a $2$D system given to you. Which of the following changes would make this model more accurate? Select all that apply. Choice $1$ of $5$:Change S $=98$ to S $=48$ Choice $2$ of $5$:Change dt $=0\mathrm{.}15$ to dt $=0\mathrm{.}05$ Choice $3$ of $5$:Change List$1=[($S$,$ I$)]$ to List$1=[$S$]$ Choice $4$ of $5$:Change Sprime $=-0\mathrm{.}2*$I $-0\mathrm{.}05*$S$*$I to Sprime $=-0\mathrm{.}2*$I Choice $5$ of $5$:No changes to the code could make this model more accurate