问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
老师可以解释一下吗?谢谢！
NO.PZ2016082406000087 A bank computes the stribution of its loportfolio marketo-market value one yefrom now using the CretMetriapproaof computing values for rating transition outcomes using a rating agentransition matrix, current forwarcurves, ancorrelations among rating transition outcomes rivefrom storeturns of the obligors. In computing firm-wi risk using this stribution of its loportfolio, the bank is most likely to unrstate its risk because it ignores The term structure of interest rates Rating ift Sprerisk The negative correlation between the Treasury rates ancret sprea ANSWER: C CretMetriignores sprerisk. It es account for rating ift anthe term structure of interest rates, albeit not their volatility. 1.为什么rf和cret sprea负相关呢？ 2.KMV,CRETRISK+,CRETMETRICS都不考虑sprerisk对吗？
A bank computes the stribution of its loportfolio marketo-market value one yefrom now using the CretMetriapproaof computing values for rating transition outcomes using a rating agentransition matrix, current forwarcurves, ancorrelations among rating transition outcomes rivefrom storeturns of the obligors. In computing firm-wi risk using this stribution of its loportfolio, the bank is most likely to unrstate its risk because it ignores The term structure of interest rates Rating ift Sprerisk The negative correlation between the Treasury rates ancret sprea ANSWER: C CretMetriignores sprerisk. It es account for rating ift anthe term structure of interest rates, albeit not their volatility. 老师好，这道题的答案是CretMetrimol没有考虑sprerisk, 题库里的NO.PZ2016082406000086这道题的是CretMetrimol考虑了cret sprea而题库里NO.PZ2016082406000092这道题的答案又说KMV, CretMetrics, CretRisk +都没有考虑interst rates or cret sprea? 感觉86题和92题是互相矛盾的。 能否请老师把KMV, CretMetrics, CretRisk +， Cret Portfolio View这四个模型分别都考虑了哪些因素做个总结？感觉基础课上讲的也不是很清楚，做题的时候还遇到了好几道这样的题目。
A bank computes the stribution of its loportfolio marketo-market value one yefrom now using the CretMetriapproaof computing values for rating transition outcomes using a rating agentransition matrix, current forwarcurves, ancorrelations among rating transition outcomes rivefrom storeturns of the obligors. In computing firm-wi risk using this stribution of its loportfolio, the bank is most likely to unrstate its risk because it ignores The term structure of interest rates Rating ift Sprerisk The negative correlation between the Treasury rates ancret sprea ANSWER: C CretMetriignores sprerisk. It es account for rating ift anthe term structure of interest rates, albeit not their volatility. 什么是rating ift
第五题和第六题是不是矛盾了，第五题问哪个因素没被crecretmetrmetrics考虑，选择了equity price（当时里有cret sprea，第六题又说ignore sprerisk
老师好，请问什么叫 “sprerisk” ?
