为什么goal不对，TEF的mission有3个目标需要实现，且这些目标都是要支付的目标，也不是asset

问题如下：

TEF’s broad approach to asset allocation can best be described as:

选项：

asset-only.

goals-based.

liability-relative.

解释：

Asset-only approaches to asset allocation focus solely on the asset side of the investor’s balance sheet. Liabilities are not explicitly modeled. Mean–variance optimization (MVO) is the most familiar and deeply studied asset-only approach. MVO considers only the expected returns, risks, and correlations of the asset classes in the opportunity set. In contrast, liability-relative and goals-based approaches explicitly account for the liability side of the economic balance sheet, dedicating assets to meet, respectively, legal liabilities or quasi-liabilities (other needs that are not strictly liabilities but are treated as such) and goals.