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B
Level line
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C
Vertical line
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D
Datum line
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Solution
The correct option is B Level line
Horizontal line: It is a line tangential to the level line lying in the horizontal plane.
Level line: It is a line lying on a level surface, normal to the plumb line at all the points.
Vertical line: It is a line normal to the horizontal line. It is a line from any point on the earth's surface to the center of the earth. It is commonly considered to be the line defined by a plumb line.
Datum line: It is a level line used to measure elevation.