Vijeeth 正在发起一项推广活动，旨在提升品牌认知度。他应该使用哪些先行指标？请选择所有适用选项。

For a brand awareness campaign, Vijeeth should focus on leading indicators that measure exposure and engagement, not direct conversions. Video views, frequency, reach, and impressions are all crucial for assessing how widely and how often the brand message is being seen. Video views indicate active engagement with video content. Frequency measures how many times, on average, an individual sees the ad, which is important for message retention. Reach quantifies the unique number of people exposed to the campaign. Impressions track the total number of times the ad was displayed. Conversions, while important for other campaign types, are a lagging indicator of direct action and not the primary goal of a brand awareness campaign.