Which one of the following statements best defines a 'level surface'?

1.	Which one of the following statements best defines a 'level surface'?
A.	A horizontal surface every element of which is normal to plumb line
B.	A curved surface every element of which is perpendicular to the spheroidal shape of the earth
C.	A plane surface which is perpendicular at all points to the direction of gravity
D.	A curved surface which is perpendicular to the direction of gravity at every point
Answer» E.

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Which one of the following statements best defines a 'level surface'?

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