You create a user control named MySearch.ascx.
You plan to change the native search control in SharePoint to MySearch.ascx. You need to provide the site administrator with the ability to change the out-ofthe-box search control to MySearch.ascx.
What should you do?
A.
Configure the SearchBox.dwp in the Web Part gallery.
B.
Override the search delegate control by using a Feature.
C.
Modify the <SafeControls> element in the web.config file.
D.
Modify \14\TEMPLATE\FEATURES\SearchWebParts\SearchBox.dwp.
Explanation:
MNEMONIC RULE: “change the native search control = Override the search delegate”Customizing the search box using a feature
http://sharepointschool.net/2010/10/14/customizing-the-search-box-using-a-feature/