After fixing the plane table to the tripod, the main operations which are needed at each plane table station are ______________ ?

After fixing the plane table to the tripod, the main operations which are needed at each plane table station are ______________ ?

1. levelling
2. orientation
3. centering
The correct sequence of these operations is
A. (1), (2),(3)
B. (1), (3), (2)
C. (3), (1), (2)
D. (2), (3), (1)