An online retail store is evaluating its marketing performance. Consider the following statements about its approach to measuring brand awareness and sales effectiveness using metric pairs and hierarchy:
- Statement I: The store uses 'Website Traffic' and 'Conversion Rate' as top-level metrics for assessing its sales objectives.
- Statement II: 'Reach' and 'Engagement Rate' are used as paired metrics to measure the depth and breadth of the brand's awareness among potential customers.
- Statement III: 'Number of Customers' and 'Return on Investment (ROI)' are dissected into 'Marketing Spend' and 'Revenue from Sales' to understand marketing efficiency.
Identify the correct combination of statements that accurately reflect the application of metric hierarchy and paired metrics in this context: