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If an airfoil is operating at Mach 1.1, then it is working in _____

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If an airfoil is operating at Mach 1.1, then it is working in _____

(a) transonic range

(b) supersonic range

(c) subsonic range

(d) hypersonic range

I got this question in examination.

My query is from Airfoil Selection-2 topic in chapter Airfoil and Geometry Selection of Aircraft Design

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The correct choice is (a) transonic range

For explanation: Based on mach number flow can be subsonic, supersonic, transonic or hypersonic. If flow mach number is <0.8 then it is subsonic. If flow mach number is >0.8 but <1.2 then, it is transonic. If flow mach number is in the range of 1.2-5.0 then, it is supersonic. If flow mach number is <5.0 then, it is hypersonic.

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