You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a custom control named Wheel. You need to ensure that the Speed property of Wheel can be animated. What should you do?

A.
Inherit the DependencyObject class.

B.
Declare the Speed property as a dependency property.

C.
Declare an animation of the Speed property from within the codebehind file.

D.
Implement the System.Windows.Media.Animation.IAnimatable interface with the Wheel class.