Which one of the following statements is not correct in respect of setting of an inclined tunnel:

[A].	Reference points are constructed at every 300 m.
[B].	The alignment is fixed from upper/lower apex point.
[C].	The level of the invert at the heading is marked by a tape.
[D].	Reference points are constructed on the roof of tunnels
[E].	None the above.

Answer: Option E

Explanation:

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