Assess the following statements related to campaign-level lever adjustments for optimal ROI. Identify which statements are accurate:
- Statement I: Allocating additional budget to new, unproven markets rather than to established high-engagement demographics is a reliable strategy for maximizing ROI.
- Statement II: For a campaign initially focused on driving site traffic, shifting to optimize for conversion rate is advisable when the business goal evolves to increasing sales.
- Statement III: Maintaining a static campaign objective, despite significant shifts in consumer behavior and market trends, is essential for campaign consistency and ROI optimization.