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What is the range of y^+ in the buffer layer?

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What is the range of y^+ in the buffer layer?

(a) 0 < y^+ < 5

(b) 5 < y^+ < 30

(c) 30 < y^+ < 500

(d) 10 < y^+ < 20

I got this question in an online interview.

The doubt is from Turbulence Modelling in portion Turbulence Modelling of Computational Fluid Dynamics

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The correct option is (b) 5 < y^+ < 30

For explanation I would say: Buffer layer has the turbulent forces and the viscous forces in equal magnitude. In this layer, the range of y^+ is  5 < y^+<30. 0 < y^+ < 5 is for the linear or viscous sub-layer. The buffer layer lies just above the viscous sub-layer.

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