IndyMac reported that during April 2008, Moody's and Standard & Poor's downgraded the ratings on a significant number of Mortgage-backed security (MBS) bonds including $160 million of those issued by IndyMac and which the bank retained in its MBS portfolio.
What was one of the agencies that downgraded a significant number of IndyMac's MBS bonds in April 2008?
Moody's