Cylinder!

A right circular cylinder with radius $r$ and height $h$ contains a liquid which evaporates at a rate proportional to its surface area of contact with air (proportionality constant $=k>0$ ). If $t$ is time after which the cylinder will be empty, then

1. $t$ is independent of $r$ .
2. $t$ is dependent on $r$ .
3. $t$ is dependent on $h$ .
4. $t$ is dependent on $k$ .

Submit the sum of the correct options above.