What should be the spacing between two diffusion layers?

1.	What should be the spacing between two diffusion layers?
A.	4‚âà√≠¬¨‚Ñ¢
B.	‚âà√≠¬¨‚Ñ¢
C.	3‚âà√≠¬¨‚Ñ¢
D.	2‚âà√≠¬¨‚Ñ¢
Answer» D. 2‚âà√≠¬¨‚Ñ¢

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