Which approach should you recommend?

You are planning an upgrade from an existing Microsoft Office SharePoint Server (MOSS) 2007 farm to a
SharePoint 2010 farm. The existing farm contains customized master pages. These master pages include
modifications of the:
Publishing Console
.Site Actions Menu
.Log-in Control
Your design must specify an upgrade to the existing master pages to function correctly in SharePoint 2010.

Which approach should you recommend?

A.
Create a new SharePoint 2010 master page and add the required controls into the Ribbon on the page.

B.
Update the cascading style sheet (CSS) styles in the core.css file of the existing SharePoint sites with the SharePoint 2010 CSS styles.
Add SharePoint 2010 content placeholders to the existing master pages.

C.
Create SharePoint 2010 delegate controls for all of the custom controls in the existing MOSS 2007 master pages.
Add these controls to the new SharePoint 2010 master pages.

D.
Use the Farm Configuration wizard to upgrade the existing MOSS 2007 master pages so that the pages are compatible with SharePoint 2010.