Assess the following statements about managing Google Ads campaigns. Identify which statements are correct:
- Statement I: The campaign level in Google Ads is primarily for setting specific ad creatives and individual ad texts.
- Statement II: Ad groups in a Google Ads campaign should be organized based on different themes or product categories for better targeting.
- Statement III: Performance measurement in Google Ads involves only tracking the total number of ad clicks and impressions.
Select the correct combination of statements.