What should you include in the recommendation?

You are developing a Windows Store app that has four pages.
Page 1 and page 2 share a set of styles. Page 3 and page 4 share a different set of styles.
You need to recommend a solution to manage the styles. The solution must meet the
following requirements:
• Ensure that the styles can be used by every app that you develop.
• Minimize the amount of effort required to update the styles across multiple apps.
What should you include in the recommendation?

A.
Define all of the styles in external files and merge the styles in App.xaml.

B.
Define all of the styles in a resource dictionary in App.xaml.

C.
Define all of the styles in resource dictionaries at the page level.

D.
Define all of the styles in the resources at the page level.