Within DynamicAction Opportunity Lists what is the difference between a theme, topic, and action?

• Action: An action is what is required by the business on the reporting of an opportunity by DynamicAction.
• Topic: Opportunities can be ranked by “Topic” which are subsets of Themes.
• Theme: Group of similar opportunities relating to one of 7 opportunity themes. Product opportunity theme examples: Conversion, Inventory, Profit, Views, Price, Returns & Cancellations, Marketing