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Which of these equations is hyperbolic?

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Which of these equations is hyperbolic?

(a) Unsteady Navier-Stokes equation

(b) Steady Navier-Stokes equation

(c) Steady Euler equation

(d) Unsteady Euler equation

I had been asked this question in a job interview.

I'd like to ask this question from Mathematical Behaviour of PDE topic in section Mathematical Behaviour of Partial Differential Equations of Computational Fluid Dynamics

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Right answer is (d) Unsteady Euler equation

Easiest explanation: Euler equations represent inviscid flows. Unsteady inviscid flows are always hyperbolic. Steady inviscid flows are conditionally hyperbolic.

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