x1 x2 Let W be the subset of R4 consisting of all vectors such that 1-2x2 = 4x3 and 2x1 = x3 + 3x4. x3 x4 Determine if W is a subspace of R4 and check the correct answer(s) below. A. W is a subspace because it can be written as N(A) for some matrix A. B. W is not a subspace because it does not have a zero element. C. W is not subspace because it does not have additive closure. D. W is a subpace because it has a zero element.

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