If \( c \) is a point at which Rolles theorem holds for the function \( f(x)=\log _{e}\left(\frac{x^{2}+\alpha}{7 x}\rig…

If \( c \) is a point at which Rolles theorem holds for the function \( f(x)=\log _{e}\left(\frac{x^{2}+\alpha}{7 x}\right) \) in the interval \( [3,4] \), where \( \alpha \in R \), then \( f^{\prime \prime}(c) \) is equal to :

[JEE Main 2020, 8 Jan (Shift 1)]