In the following assertions for the basis matrix of an LP problem with standard form, which one is incorrect（ ）

A、Thefeasiblebasismatrixmightnotexist.
B、Thecolumnvectorsofabasisarelinearlyindependent.
C、Thebasismatrixisuniquelydeterminedforagivenbasicsolution.
D、Thenumberofbasismatrixisfinite.