Interpreting Derivatives of a Rate Function

For time $t \geq 0$ hours, $A(t)$ represents the rate, in square meters per hour, at which the area of an oil slick is expanding. Consider the following scenarios at $t=3$:

I. $A'(3) > 0$ and $A(3) > 0$

II. $A'(3) < 0$ and $A(3) > 0$

III. $A'(3) = 0$ and $A(3) > 0$

Which scenario describes the condition that at $t=3$ hours, the area of the oil slick is increasing, but its rate of expansion is decreasing?