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What happens to the flow around the airfoil at upper critical Mach number?

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What happens to the flow around the airfoil at upper critical Mach number?

(a) The flow around airfoil becomes subsonic

(b) The flow around airfoil becomes supersonic

(c) The flow around airfoil becomes sonic

(d) The flow around airfoil becomes hypersonic

I had been asked this question by my college director while I was bunking the class.

My question is from Critical Mach Number in portion Linearized and Conical Flows of Aerodynamics

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The correct option is (b) The flow around airfoil becomes supersonic

Explanation: Critical Mach number is of two kinds –  lower and upper critical Mach number. When the flow around the airfoil is at the upper critical Mach number, then the flow around the entire airfoil reaches supersonic speed.

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