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If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to_________________?
1. altitude bubble on index frame
2. altitude bubble on index frame if it is to be used as a level
3. altitude bubble on telescope
4. altitude bubble on telescope if it is to be used as a level
The correct answer is?

A. only (1)

B. both (1) and (4)

C. only (3)

D. both (2) and (3)

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