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。以下正确的是
A．Private Sub Command1_Click()
Command2.Visible=True
Command3.Visible=False
End Sub
B．Private Sub Command1_Click()
Command2.Enabled=True
Command3.Enabled=False
End Sub
C．Private Sub Command1_Click()
Command2.Enabled=True
Command3.Visible=False
End Sub
D．Private Sub Command1_Click()
Command2.Visible=True
Command3.Enabled=False
End Sub