A water is catapulted into the air from the top of a building. The height $h(t)$ in meter of the ballon after $'t'$ seconds is $h(t) = -5t^2 + 30t +10$ <br> <br> QUESTION : What are the range of this function ?

Question

$\begin{array}{1 1} (a)\; \{ h(t) \in R /0 \leq h (t) < 55\} \\ (b)\; \{ h(t) \in R /0 < h (t) < 55\} \\ (c)\; \{ h(t) \in R /0 \leq h (t) \leq 55\} \\ (d)\; \{ h(t) \in R /0 \geq h (t) \geq 55\} \end{array}$