You develop a Web control. The Web control consists of labels and associated text boxes.You need to ensure that the Web control has both toolbox and visual designer support. What should you do?（）

Add a Web Control Library project to your solution. Define a class that inherits from CompositeControl.
B. Add a Windows Control Library project to your solution. Define a class that inherits from UserControl.
C. Add a Web User Control to your project. Define a class that inherits from UserControl.
D. Add a Mobile Web User Control to your project. Define a class that inherits from MobileUserControl.