The R.L. of the point "A" which is on the floor is 110 m and back sight reading on "A" is 2.635 m. If the foresight reading on the point "B" which is on the ceiling is 2.575 m, the R.L. of point "B" will be
- A. 112.635 m
- B. 107.365 m
- C. 110.000 m
- D. 115.270 m