Which approach should you recommend?

You are designing a SharePoint 2010 intranet site. Your design must:
Specify the manner in which to store and read custom configuration settings.
.Use a standard user interface to allow the configuration settings to be created or changed.
You need to design the solution at the site collection and site levels to meet these requirements.
Which approach should you recommend?

A.
Use the property bag to store custom configuration settings.

B.
Use the hierarchical object store to store custom configuration settings

C.
Use SharePoint lists to store the custom configuration settings

D.
Add custom configuration settings in the web.config file to display the settings