You are evaluating four different campaigns, each with a distinct business objective. Match each campaign objective with the most appropriate set of primary metrics:
- Campaign Objective I: Increase overall brand awareness in a new market.
- Campaign Objective II: Boost online sales for a seasonal product line.
- Campaign Objective III: Enhance customer loyalty and repeat purchases for a subscription service.
- Campaign Objective IV: Drive higher engagement on the company’s main social media platform.
Determine the correct set of primary metrics for each campaign objective.