How Did Some Settlers and Corporations Commit Fraud Under the Homestead

How did some settlers and corporations commit fraud under the Homestead Act?

A) by hiring employees and immigrants to serve as "dummy" homesteaders
B) by posing as government agents and seizing the land
C) bribing civil service workers in the Land Grant Office
D) bribing members of the United States Senate
E) murdering homesteaders and assuming their identity