Santosh 正在领英上投放其首个广告推广活动，他资源有限。他在设计广告素材时，应该考虑哪些方面？请选择所有合适选项。

When resources are limited, it's crucial to maximize efficiency and impact. Using various ad formats helps keep the audience engaged and allows for testing what resonates best, which is vital for optimizing performance. Creating multiple ad creatives quickly by reusing the same image and only changing headlines is a time-saving strategy that enables A/B testing of different messaging without extensive design work. Repurposing existing content is a highly efficient way to generate new ad creatives without needing to produce entirely new assets, saving both time and money. Developing a strong video ad campaign, while effective, might be resource-intensive for a first campaign with limited resources, as video production often requires significant time, skill, and budget.