窗体上添加有3个命令按钮，分别命名为Command1、Command2和Command3，编写Command1的单击事件过程，完成的功能为：当单击按钮Command1时，按钮Command2可用，按钮Command3不可见。下列程序中正确的是( )。

A．Private Sub Command1 Click()

Command2.Visible=True

Command3.Visible=False

End Sub
B．Private Sub Command1 Click()

Command2.Enabled=True

Command3.Visible=False

End Sub
C．Private Sub Command1_Click()

Command2.Enabled=True

Command3.VSible=False

End Sub
D．Private Sub Command1_Click()

Command2.Visible=True

Command3.Enabled=False

End Sub