Pick up the correct statement from the following :

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Question:Pick up the correct statement from the following :

1.the lines of sight while observing back sight and fore sight lie in the same horizontal plane

2.the staff readings are measurements made vertically downwards from a horizontal plane

3.the horizontal plane with reference to which staff readings are taken, coincides with the level surface through the telescope axis

4. all the above.

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  1. Pick up the correct statement from the following :
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