Differentiability of a Piecewise Function

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Let $f$ be the function defined by $\displaystyle f(x) = \begin{cases} 2x + 5 & \text{for } x < -1 \\ -x^2 + 6 & \text{for } x \geq -1 \end{cases}$ . What is the value of $\displaystyle f'(-1)$ ?

$\displaystyle \text{nonexistent}$

$\displaystyle 2$

$\displaystyle -2$

$\displaystyle 3$

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