• Bidding optimization
• Targeting optimization
• Media mix optimization
• Channel optimization

The Correct Answer is: Media mix optimization. AND Channel optimization.

Explanation: The two types of optimization critical to marketing strategies are Media Mix Optimization and Channel Optimization. Media Mix Optimization emphasizes adjusting media investment across different channels based on performance. For instance, if video ads have higher ROI than display ads, resources might be reallocated accordingly. Channel Optimization, conversely, refines ad delivery within a particular channel through strategies like bid adjustment, creative customization, and dynamic audience targeting, all to maximize business outcomes.