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What is the relation between the drag divergence Mach number and critical Mach number?

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What is the relation between the drag divergence Mach number and critical Mach number?

(a) Mdrag – divergence = Mcrit

(b) Mdrag – divergence > Mcrit

(c) Mdrag – divergence < Mcrit

(d) Mdrag – divergence × Mcrit = 0

The question was asked in unit test.

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

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Right option is (b) Mdrag – divergence > Mcrit

For explanation I would say: Drag –  divergence Mach number is greater than critical Mach number. At this Mach speed, there is a region of local supersonic flow followed by a shock wave. This results in pressure drag eventually causing boundary layer separation.

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