Which of the following attributes are typical for early models of statistical credit analysis?

Which of the following attributes are typical for early models of statistical credit analysis?
A . These models assumed the default of any obligor was independent of the default of any other.
B . The underlying default assumptions were analytically inconvenient.
C . The underlying default assumptions failed to develop relatively simple formulas for the determination of portfolio credit risk.
D . These models effectively incorporated herd behavior.

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Answer: A