Sensitivity of \(\mathrm{T}(\mathrm{s})\) with respect to a parameter \((\alpha)\) in \(\mathrm{G}(\mathrm{s})\) is given by

a) \(S_{\alpha}^{T}=\frac{\partial T / T}{\partial \alpha / \alpha}\)

b) \(S_{\alpha}^{T}=S_{G}^{T} S_{\alpha}^{G}\)

c) \(S_{\alpha}^{T}=\left(\frac{\partial T}{\partial G}\right)\left(\frac{G}{T}\right)\left(\frac{\partial G}{\partial \alpha}\right)\left(\frac{\alpha}{G}\right)\)

d) All of the above