Let u4 be a linear combination of {u₁, U₂, U3}. Select the best statement. OA. We only know that span {u₁, U₂, U3} C span{u₁, U₂, U3, U4} . B. There is no obvious relationship between span{u₁, U₂, U3} and span{u₁, U₂, U3, U4₂ } . © C. span{u₁, U₂, U3} = span{U₁, U₂, U3, U4 } . D. span{u₁, U₂, U3 } = span{U₁, U₂, U3, U4} when u4 is a scalar multiple of one of {u₁, U₂, U3}. E. none of the above

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