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What is the correct answer?


Pick up the correct statement from the following:

A. The vertical plane containing the zenith, the station of observation and the celestial pole is the observer's meridian plane

B. The angle between the direction of star in vertical plane and the direction of the star in horizontal plane is called the altitude of the star

C. The complement of the altitude of star is called the zenith distance of the star

D. All the above

Please do not use chat terms. Example: avoid using "grt" instead of "great".