If $f(x)= \left\{ \begin{array}{1 1} x-5, & \quad for\; x \leq 1 \\ 4x^2-9, & \quad for\;1 < x < 2 \\ 3x+4, &\quad for\; x \geq 2 \end{array} \right.$ then $f'(2^{+})$ is equal to

Question

$$\begin {array} {1 1} (a)\;0 & \quad (b)\;2 \\ (c)\;3 & \quad (d)\;4 \end {array}$$