Which of the following is not a vector space?    A. The set of all 2x2 with integer entries and with the standard operations of matrix addition and scalar multiplication.  B. The set of all 2x2 matrices of the form (000b) with the standard operations of matrix addition and scalar multiplication.  C. The set of all 2x2 matrices of the form (a00b) with the standard operations of matrix addition and scalar multiplication.  D. The set of all 2x2 matrices with real entries, and with the standard operations of addition and scalar multiplication.

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