Let $f(x)=\{\begin{array}{cc}-\frac{sin(-x)}{x},& x<mn>0</mn>\\ a-b^{2}x,& 0x<mn>1</mn>\\ ta{n}^{-1}(x-1),& x1\end{array}$

Which values of a and $b$ make the function $f(x)$ continuous on the interval $(-,)?$

$($a$),a=,b=0$

$($b$)a=,b=-\sqrt[\phantom{2}]{}$

$($c$),a=-,b=\sqrt[\phantom{2}]{}$

$($d$),a=0,b=0$

$($e$)a=-,b=0$