A.
the mortgage pass - through, a security that has the borrower's mortgage payments pass through the trustee before being disbursed to the investors.
B.
collateralized mortgage obligations, a security which reduces prepayment risk.
C.
the participation certificate, a security which passes the borrower's mortgage payments equally among all the owners of the certificates.
D.
the securitized mortgage, a security which increases the liquidity of otherwise illiquid mortgages.