Let u be a linear combination of {u₁, U₂, U3}. Select the best statement. OA. span{u₁, U₂, U3} = span{u₁, U₂, U3, U4} when u is a scalar multiple of one of {U₁, U₂, U3}. B. span{u₁, U₂, U3} = span{u₁, U₂, U3, U4}. C. We only know that span{u₁, U₂, U3} span{u₁, U₂, U3, U₁}. D. There is no obvious relationship between span{u₁, U₂, U3} and span{u₁, U₂, U3, U₁} . E. none of the above

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