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

1.	What is the range of y+ in the buffer layer?
A.	0 < y<sup>+</sup> < 5
B.	5 < y<sup>+</sup> < 30
C.	30 < y<sup>+</sup> < 500
D.	10 < y<sup>+</sup> < 20
Answer» C. 30 < y<sup>+</sup> < 500

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