A. Create a custom model that will, among other things, call the setTheme ( ) method.

B. Create custom controllerthat will, among other things, call the setTheme ( ) method.

C. Create custom widget that will, among other things, call the setTheme ( ) method.

D. Define themes in the template by using the <rn:theme> page tag.

E. Create the pre_page_r@nder hook.

F. Create the post_page_render hook.

G. Create themes in mapping.php by using the <m:theme> page tag.