Which approach should you recommend?

You are designing a SharePoint 2010 solution package that includes a feature. The feature should be available
for activation in only those site collections contained within specified Web applications in the farm.
You need to design your solution package to ensure this behavior.
Which approach should you recommend?

A.
Create a sandboxed solution and set the scope of the feature to Web Application.

B.
Create a sandboxed solution and set the scope of the feature to Site.

C.
Create a farm solution and set the Deployment Target property of the feature assembly to GlobalAssemblCache.

D.
Create a farm solution and set the Deployment Target property of the feature assembly to Web Application.