Which of the following represents series type deactivation model? (Where R is the product and P is the poison)

(a) A → R → P↓

(b) A → P↓

(c) A→R + P↓

(d) A → R, A → P

I had been asked this question during an interview.

My question is from Mechanisms of Catalyst Deactivation topic in chapter Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

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