To perform a bulk creatives upload in Display & Video 360, what should you do?

The correct answer offers all valid methods for bulk creative uploads. Display & Video 360 supports direct uploads of creative assets, which is suitable for smaller batches. For larger or more automated processes, the Display & Video 360 API allows programmatic creative management. Additionally, a spreadsheet template can be used to define creative properties and then import them, facilitating bulk creation. The other options are incorrect because they either omit valid methods (like direct upload or API) or incorrectly state that direct uploads are not possible.