Please explain the answer and your steps $to$ the following question $in$ the attached picture.

$(a)$ Consider the finite solid bounded $by$ the three surfaces: $z=e^{-x^2-y^2},z=0$ and $x^2+y^2=4.$

$i.$ Set $up(butdo$ not evaluate$)$ a triple integral $in$ rectangular coordinates that describes

the volume $of$ the solid.

$ii.$ Calculate the volume $of$ the solid using any method.