Which of the Following Statements Is False

Which of the following statements is false?

A) The registered bond system also facilitates tax collection because the government can easily keep track of all interest payments made.
B) Asset backed bonds and mortgage bonds are secured debt: specific assets are pledged as collateral that bondholders have a direct claim to in the event of bankruptcy.
C) Notes typically have longer maturities (more than ten years) than debentures.
D) Although the word "bond" is commonly used to mean any kind of debt security, technically a corporate bond must be secured.