Let $\displaystyle f(x) = \begin{cases} %0 & \text{if } %3 \\ %1 & \text{if } %4 \\ %2 & \text{if } %5 \end{cases}$.

Which is the correct graph of $f$? MULTIPLECHOICE

$f$ isRADIO at $x = %6$,     and     RADIO at $x = %7$.