To generate the j the column of the flexibility matrix________________?

A. a unit force is applied at coordinate j and the displacements are calculated at all coordinates

B. a unit displacement is applied at co-ordinate j and the forces are calculated at all coordinates

C. a unit force is applied at coordinate j and the forces are calculated at all coordinates

D. a unit displacement is applied at co-ordinate j and the displacements are calculated at all co-ordinates

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