As the both ends pinned slender column with rectangle cross-section is unstable, which is correct in the following options?
A.
The critical pressure force F cr =π 2 EI y /l 2 , and the deflection curve is on the xy plane
B.
The critical pressure force F cr =π 2 EI y /l 2 , and the deflection curve is on the xz plane
C.
The critical pressure force F cr =π 2 EI z /l 2 , and the deflection curve is on the xy plane
D.
The critical pressure force F cr =π 2 EI z /l 2 , and the deflection curve is on the xz plane