Final answer:
The optimal time to test and experiment with your ads is after the ad goes live, allowing for real data collection and performance adjustments to maximize the effectiveness of the advertising campaign.
Step-by-step explanation:
The best time to run tests and experiments on your ads is after the ad goes live (option b). Testing before creating the ad may provide insights into audience preferences, but you cannot measure actual performance until the ad is in the wild. During the ad creation phase, you may make assumptions about your design and copy, but these are hypotheses that will need testing. Once the ad is live, you can gather real data on its effectiveness. After the ad budget allocation, it's essential to monitor and tweak the ads to ensure they are performing as expected and to maximize the return on your investment. Experiments could involve A/B testing different versions of the ad to see which performs better or trying out different targeting options.