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For which of these Mach numbers is flow considered to be hypersonic?

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For which of these Mach numbers is flow considered to be hypersonic?

(a) M < 1

(b) M = 1

(c) M > 5

(d) 1 < M < 5

The question was posed to me at a job interview.

I need to ask this question from Hypersonic Flow topic in division Transonic and Hypersonic Flows of Aerodynamics

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Correct option is (c) M > 5

Easiest explanation: Flow with Mach number less than 1 is known as subsonic flow. Mach number greater than 1 is considered to be supersonic flow with sonic flow at Mach = 1. After Mach greater than 5, the flow properties change drastically and is known as hypersonic flow.

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