A Collateralized Mortgage Obligation (CMO):(A) is a financial derivative that has no purpose other than to providea tool for investors to speculate on the housing market.(B) can add economic efficiency to the housing market by introducingtranches that enable the level of risk of the assets to be matched with investor's preference for risk.(C) can only be issued by financial firms that are subject to govern-ment regulations.(D) provides insurance against default on a mortgage contract.