Final answer:
Barrier precautions involve the use of physical barriers and environmental control methods to protect the health care worker.
Step-by-step explanation:
The answer to the question is c) Barrier precautions. Barrier precautions involve the use of physical barriers, such as gloves, masks, and gowns, to prevent the transmission of infectious agents. Environmental control methods, such as disinfection and sterilization of equipment, are also part of barrier precautions. These precautions are important in protecting the health care worker from coming into direct contact with potentially infectious body fluids and surfaces.