Meaning of the Derivative in Context Practice Test

The balloon’s radius at $t=20$ seconds, in centimeters.

The total increase in radius during the first 20 seconds, in centimeters per second.

The time needed for the radius to increase by 20 centimeters, in seconds.

The instantaneous rate the radius is changing at $t=20$ seconds, in centimeters per second.

The balloon’s surface area at $t=20$ seconds, in square centimeters per second.