What is the innermost portion of approach zone which is the most critical portion from obstruction viewpoint, called ?

What is the innermost portion of approach zone which is the most criti

1.	What is the innermost portion of approach zone which is the most critical portion from obstruction viewpoint, called ?
A.	Outer horizontal surface
B.	Conical surface
C.	Inner horizontal surface
D.	Clear zone
Answer» C. Inner horizontal surface

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What is the innermost portion of approach zone which is the most critical portion from obstruction viewpoint, called ?

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