One hallmark of the mortgage-banking crisis, robo-signing, in which banks blindly accepted legal documents without checking them for accuracy or authenticity, has led to a series of lawsuits against large banks such as bank of america and citigroup.
(a) one hallmark of the mortgage-banking crisis, robo-signing, in which banks
(b) robo-signing was one hallmark of the mortgage-banking crisis, in which banks
(c) robo-signing, which was one hallmark of the mortgage-banking crisis and which banks
(d) one hallmark of the mortgage-banking crisis was robo-signing, in which banks
(e) one hallmark of the mortgage-banking crisis was robo-signing, and banks