Which approach should you recommend?

You are designing a solution for a SharePoint 2010 site. You need to design a solution that includes:
Custom pages to add, view, and update list items.
.Custom workflows with code on list items.
Which approach should you recommend?

A.
Design a sandboxed solution that includes workflows with code and custom application pages.

B.
Design multiple sandboxed solutions that include workflows with code and custom application pages.

C.
Design a farm solution that includes workflows with code and custom application pages.

D.
Design a farm solution that includes workflows with code.
Develop list application pages and use the Stsadm tool to deploy them manually to the bin folder of the Web application.