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【单选题】
设A，B是正定矩阵，C是可逆矩阵，下列矩阵不是正定矩阵的是( )．A.
C\r\n T \r\nAC
B.
A\r\n —1 \r\n+B\r\n —1
C.
A\r\n * \r\n+B\r\n *
D.
A—B
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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