How are mortgages and deeds related to one another?

A. They are two different methods to give a lender a security interest in real property of the debtor

B. Mortgages are used for real property, and deeds of trust are used for personal property

C. Mortgages are used to create a security agreement covering residential real property, and deeds of trust are used in connection with commercial real property

D. They are two names for the same instrument, and thus can be used interchangeably

E. They are two distinct aspects of a security agreement covering real property, both which must be present for the security interest to be valid