Question:What is a Decorator in WPF of .Net framework 4.0? 

A It is used to add functional handles to elements or provide state information about a control. 
B It is the base class for elements that apply effects onto or around a single child element, such as Border or Viewbox. 
C It provides a set of services that can be used to extend the functionality of a common language runtime property. 
D t is a property with the exception that its value cannot be set outside the class that declared the read-only property. 

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Mohammad Towhidul Islam

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