Which of the following provide helpful information for locating a defendant so that process can be served?

A) Social Security offices
B) Landlords
C) County tax rolls
D) All of these choices are correct.

All of these choices can provide helpful information for locating a defendant. Social Security offices may have current address information, landlords can provide tenant information, and county tax rolls can reveal property ownership, all of which are useful in locating someone for process serving.