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请帮忙给出正确答案和分析，谢谢！