Following namespace used for dataset and datatable
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System.Data.SqlClient
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System.Data.OracleClient
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System.Data.Odbc
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System.Data
D
Correct answer
Explanation
DataSet and DataTable are core ADO.NET classes in the System.Data namespace. The other options are provider-specific namespaces for SQL Server, Oracle, and ODBC respectively, which contain connection and command classes but not the core DataSet/DataTable types.