Determine whether the set W is a subspace of R° with the standard operations. If not, state why. (Select all that apply.) W = {(x1X2, X1 X2): x1 and x2 are real numbers} O w is a subspace of R. O w is not a subspace of R because it is not closed under addition. O w is not a subspace of R because it is not closed under scalar multiplication.

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