Final answer:
Wearing gloves and masks, using disposable materials, and proper sterilization techniques are all methods used to protect against biohazard contamination from impressions.
Step-by-step explanation:
All of the above is the correct answer. To protect against biohazard contamination from impressions, it is important to wear gloves and masks to prevent direct contact with the biohazardous material. Using disposable materials, such as gloves and tools, ensures that there is no cross-contamination between different samples. Proper sterilization techniques, such as autoclaving or using strong basic solutions, effectively kill any biohazardous organisms and prevent their spread.