单项选择题
You are creating a Windows application for a financial services provider by using the .NET Framework 3.5. You write the following code segment in the form （Line numbers are included for reference only.）
The connection string for the financial services database is stored in the variable named connString.You need to ensure that the form populates a DataGridView control named gridCAT.
Which code segment should you add at line 03？（）
A.A
B.B
C.C
D.D
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