Which of the following reactor arrangements causes fast deactivation?

(a) Mixed flow for fluid

(b) Plug flow for fluid

(c) Fluidised bed reactor

(d) Batch for fluid and solid

I have been asked this question by my school teacher while I was bunking the class.

The query 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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