请定义营销团队确认的销售线索 (MQL)。

A Marketing Qualified Lead (MQL) is an individual who has engaged with a company's marketing efforts and is deemed more likely to become a customer compared to other leads. This assessment is based on their behavior, demographics, and engagement with marketing content, indicating a higher level of interest and alignment with the ideal customer profile. The other options are incorrect because: "预估的可用客户群" (Estimated available customer base) refers to the total market potential, not a specific lead. "通过表格获得的联系人数量" (Number of contacts obtained through forms) is a metric of lead generation, but these contacts are not necessarily qualified as MQLs without further assessment. "发掘销售线索的销售人员" (Salesperson who discovers sales leads) describes an individual role, not the definition of an MQL itself.