有 3 位广告主在竞拍出价。广告主 A 出价 12 美元，相关度评分为 4。广告主 B 出价 8 美元，相关度评分为 9。广告主 C 出价 4 美元，相关度评分为 3。哪位广告主会赢得竞拍？

LinkedIn's ad auction uses a "Generalized Second-Price Auction" model, where the winner is determined by a combination of bid amount and relevance score. The effective bid is calculated as Bid x Relevance Score. For Advertiser A: $12 x 4 = $48 For Advertiser B: $8 x 9 = $72 For Advertiser C: $4 x 3 = $12 Advertiser B has the highest effective bid ($72), making them the winner of the auction. Advertiser A and C have lower effective bids, so they would not win.