For the solution for displacements of statically indeterminate structure, which statement is correct?
A.
This displacement formula still work.
B.
The primary structure set up for the calculation of desired displacement should be the same one that has been used to determine internal forces in the original structure.
C.
The primary structure set up for the calculation of desired displacement don't need to be the same one that has been used to determine internal forces in the original structure.
D.
We can choose any primary structure for the original structure to calculate the desired displacement because all primary structures have the same internal forces and displacement with the original structure's.