How Are Mortgages and Deeds of Trust Related to One

How are mortgages and deeds of trust related to one another?

A) They are two different methods to give a lender a security interest in real property of the debtor.
B) They are two names for the same instrument,and thus can be used interchangeably.
C) They are two distinct aspects of a security agreement covering real property,both of which must be present for the security interest to be valid.
D) Mortgages are used for real property,and deeds of trust are used for personal property.
E) Mortgages are used to create a security agreement covering residential real property,and deeds of trust are used in connection with commercial real property.