你的客戶只規劃一筆固定費用做為廣告活動支出，但想獲得可觀的投資報酬率。請問他們應在 Search Ads 360 的 Performance Center 中進行哪項設定，才能達到這個目標？

The correct answer is "預算出價策略" (Budget bid strategy). A budget bid strategy in Search Ads 360 is designed to help advertisers achieve specific performance goals within a fixed budget. It automatically adjusts bids across campaigns to maximize conversions or revenue while staying within the allocated spend. This directly addresses the client's need for a significant return on investment from a fixed advertising budget. "轉換購物車資料" (Conversion cart data) is information about items in a shopping cart, which can be used for reporting and optimization, but it's not a bidding strategy itself. "Google Ads 競價期間出價" (Google Ads auction-time bidding) refers to real-time bidding in Google Ads, which is a mechanism, not a strategy for managing a fixed budget across campaigns. "以數據為準歸因" (Data-driven attribution) is a method for assigning credit to touchpoints in a conversion path, useful for understanding performance but not a bidding strategy for budget allocation.