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What is the correct answer?

4

Pick up the correct statement from the following:

A. The measured stereoscopic base of photographs is obtained by dividing the air base in metres by the mean scale of the photograph

B. The difference between the absolute parallax of two points depends upon the difference in their elevations

C. The line joining the principal point of a photograph and the transferred principal point of the adjoining photograph, is called stereoscopic base

D. All the above

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