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()<br> Command2.Visible=True<br> Command3.Visible=False<br> End Sub
B．Private Sub Command1_Click()<br> Command2.Enabled=True<br> Command3.Enabled=False<br> End Sub
C．Private Sub Command1_Click()<br> Command2.Enabled=True<br> Command3.Visible=False<br> End Sub
D．Private Sub Command1_Click()<br> Command2.Visible=True<br> Command3.Enabled=False<br> End Sub