根据领英建议，在为广告推广活动制作广告素材时，您应考虑哪些要素？请选择所有合适选项。

When creating ad creatives for LinkedIn campaigns, it's crucial to consider several elements to maximize effectiveness. 文案 (Copy) is essential as it communicates your message and call to action. Strong, concise copy resonates with the professional audience. 配图 (Imagery), including videos or static images, is vital for capturing attention and conveying brand identity. High-quality, relevant visuals significantly impact engagement. 形式 (Format) refers to the ad type, such as single image, video, carousel, or document ads. Choosing the right format depends on your content and campaign goals. Finally, 测试 (Testing) is paramount. A/B testing different versions of your copy, imagery, and formats allows you to identify what performs best with your target audience, leading to continuous optimization. "全新内容 (New content)" is not a standalone element to consider when creating creatives; rather, it's a strategy that might involve using new copy, imagery, or formats.