If $$K_{f}$$ is the fatigue stress concentration factor and $$K_{t}$$ is the theoretical stress concentration factor then, the notch sensitivity q is?

A

$$\frac{(K_{f}+1)}{(k_{t}+1)}$$

B

$$\frac{(K_{f}-1)}{(k_{t}-1)}$$

C

$$\frac{(K_{t}-1)}{(k_{f}-1)}$$

D

$$\frac{(K_{f}-1)}{(k_{t}+1)}$$