You have an existing SharePoint 2010 solution consisting of custom Web Parts deployed to
the global assembly cache (GAC). The signing key used for the Web Parts has recently
changed. You need to design an update to the Web Parts without any change to the value
settings of their properties. Which approach should you recommend?

A.
Update the Web Parts through the Web Part gallery and select the Overwrite if file
already exists check box.

B.
Deploy the changes within a SharePoint solution.

C.
Copy the changes directly to the GAC and perform an IISReset.

D.
Programmatically copy the information from the existing Web Parts to their new versions
and then remove the old instances.