The D.C. Court of Appeals formulated a test for determining whether the general duty clause of the OSH Act has been violated in which case?
a) Donovan v. Missouri Farmers Assn.
b) National Realty and Construction Co. v. Occupational Safety and Health Review Commission.
c) Caterpillar Inc. v. Occupational Safety and Health Review Commission
d) Phoenix Roofing, Inc v. OSHA