NO.PZ2020033002000086
问题如下：
The CreditMetrics model uses three primary factors except:
选项：
A.Credit ratings
B.Seniority
C.Equity prices
D.Recovery rates
解释：
C is correct.
考点：CreditMetrics
解析：
CreditMetrics uses credit ratings, the transition matrix, recovery rates, and LGD for various seniorities, but not equity prices for the obligor.
请问B选项怎么理解
