You create a Web server control named ContosoControls. You add a Web custom control named ContosoMailer to it. You then distribute the Web Control Library files to your team. You need to provide your team with the correct procedure for adding the Web Control Library to the items in the toolbox of Microsoft Visual Studio .NET. Which procedure should you provide to the team? （）

• A、Within the toolbox, click Choose Items and then browse to and select the ContosoControls user control.
• B、Within the toolbox, click Choose Items and then browse to and select the ContosoMailer user control.
• C、Right-click Web Project, click Add Reference, and then browse to and select the ContosoControls.dll file.
• D、Within the toolbox, click Choose Items and then browse to and select the ContosoControls.dll file.