Which of the Following Statements Is False

Which of the following statements is false

A) Extension methods must be defined as static methods in a static class.
B) The compiler implicitly passes the object that's used to call the method as the extension method's first argument. This allows you to call an extension method as if it were an instance method of the extended class.
C) An extension method's fully qualified name is the name of the class in which the extension method is defined, followed by the name of the method and its argument list. When using the fully qualified method name, you must specify an argument for the first parameter.
D) If the type being extended defines an instance method with the same name as your extension method and a compatible signature, the extension method shadows the instance method.