Write the standard first-order plus dead-time (FOPDT) model form and identify its parameters.

• A. Gp(s) = Kp / (tau_p s + 1); parameters Kp and tau_p.
• B. Gp(s) = Kp e^{-Ls} / s; parameters Kp and L.
• C. Gp(s) = Kp e^{-Ls} / (tau_p s + 1); parameters: Kp (process gain), L (dead time), tau_p (time constant).
• D. Gp(s) = 1 / (tau_p s + 1); parameters tau_p.

Answer: (C)