单选题 ＿＿＿＿＿＿＿＿＿＿, such as the SQL Server and Oracle providers, typically offer performance improvements due, in part, to the fact that there is one less layer of abstraction. 的答案

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题目内容：
＿＿＿＿＿＿＿＿＿＿, such as the SQL Server and Oracle providers, typically offer performance improvements due, in part, to the fact that there is one less layer of abstraction.
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