The Lesson from the Credit Crisis of 2007-2009 Is That

The lesson from the credit crisis of 2007-2009 is that securitized assets and credit swaps:

A) are complex financial instruments.
B) are difficult to correctly value and measure in terms of risk exposure.
C) are a part of cyclically sensitive markets.
D) possible vehicles to set in motion a financial contagion that cannot be easily stopped without active government intervention.
E) All of the options are correct.