$5$ What are the possible values for $f^{\text{'}}(x)$ if $f^{\text{'}}(x)$ eaids and $f(x_1)>f(x_3)$ for every

$a.f^{\text{'}}(x)<mn\; id="EditorElement\_12726930">0</mn>$

$c{f}^{\text{'}}(x)=0$

$b.f^{\text{'}}(x)>0$

$d{f}^{\text{'}}(x)0$