Question $3(Mandatory)(1$ point$)$

$Iff(x)=e^{-x^{-1}},$ calculate $f^{\text{'}}(2).$

$a{f}^{\text{'}}(2)=-\frac{1}{2}\sqrt[\phantom{2}]{e}$

$b{f}^{\text{'}}(2)=e^{\frac{1}{4}}$

$c{f}^{\text{'}}(2)=\frac{1}{4\sqrt[\phantom{2}]{e}}$

$d{f}^{\text{'}}(2)=-\frac{1}{4}{e}^{\frac{1}{4}}$