Which of the following is not a subspace of AW₂ = {(a,b,c,d)|a+b+c+d=1} BW₁ = {(a, a, b, b) | a, b = R} CW₂ = {(a, b, c, d) | a = b, c =d} DW₁ = {(a + b, a, b, 0)| a, b < R}

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A: (a), (b) , (c), (d)  are subspaces .

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