Features of Dependency Properties in windows 8 Store App

Question

Hello every one i am not sure about the Features of Dependency Properties in windows 8 Store App. For this i read this article but i can't clear. Can any one help me to clear me what is not the features Dependency Properties in windows 8 Store App in this list Thanks.

 

 

1. Dependency properties provide facilities to compute a given property's value based on several inputs.

2. Dependency properties can notify about changes in their values.

3. A callback handler can be assigned, so that whenever the property is changed, the callback handler will be invoked.

4. Dependency properties can have a default value through metadata.

5. None of the above. 

 

Article

https://docs.microsoft.com/en-us/windows/uwp/xaml-platform/dependency-properties-overview