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Which of these assumptions are not made while obtaining the linearized perturbation velocity potential equation?

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Which of these assumptions are not made while obtaining the linearized perturbation velocity potential equation?

(a) Small perturbations are there

(b) Transonic flow is excluded

(c) Hypersonic flow is excluded

(d) Subsonic flow is excluded

I had been asked this question during an interview for a job.

The doubt is from Linearized Velocity Potential Equation in section Linearized and Conical Flows of Aerodynamics

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Correct option is (d) Subsonic flow is excluded

Easiest explanation: In order to obtain the linearized perturbation velocity potential equation, there are few assumptions made. The perturbations u^‘, v^‘, w^‘ are assumed to be small in comparison to the free stream velocity. Apart from this the equation is not applicable for transonic flow with Mach number between 0.8 and 1.2 and for hypersonic flow with Mach number greater than 5.

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