Which of the Following Best Describes a Mortgage-Backed Security

Which of the following best describes a mortgage-backed security?

A) A mortgage-backed security is simply the stock of a mortgage company.
B) A mortgage-backed security is a bond offered by a mortgage company.
C) A mortgage-backed security is a bundle of mortgages.The new security is then put up for auction by the government.
D) A mortgage-backed security is a combination,or bundle,of mortgages.The new security is then available for resale in secondary markets.
E) A mortgage-backed security is an investment with a very high interest rate and very low return.This security is available for resale in secondary markets.