Ravi 希望以最高的效率收集销售线索，他应使用哪个目标？

The correct answer is "销售线索挖掘" (Lead Generation) because this objective is specifically designed to collect sales leads efficiently. LinkedIn's Lead Generation campaigns are optimized to capture contact information directly within the platform or through lead gen forms, streamlining the lead collection process for businesses like Ravi's. "网站访问量" (Website Visits) focuses on driving traffic to a website, which may or may not result in lead capture. "参与度" (Engagement) aims to increase interactions with content, not necessarily to gather leads. "网站转化量" (Website Conversions) is broader and could include various actions on a website beyond just lead collection, such as purchases or sign-ups, and requires users to leave LinkedIn. While website conversions can include lead forms, the Lead Generation objective is more direct and efficient for the specific goal of collecting leads.