c$.$ Figure $3$ shows the input valve opening $(\%)$ and the output concentration $(\%$A$)$

i$.$ By using the process reaction approach, calculate the value of Gain, K$,$ time constant, $T,$ and time delay, Td$.$

ii$.$ By using the Cohen$-$Coon tuning approach in Appendix and data $5($c$)$i$,$ analyze the tuning algorithm for the proposed Proportional$-$Derivative $($PD$)$ controller.