Final answer:
The critical area of the LAFW is the flow of air between the HEPA filter and the sterile workspace.
Step-by-step explanation:
The critical area of the LAFW (Laminar Air Flow Workbench) is b. The flow of air between the HEPA filter and the sterile workspace.
The HEPA filter is an important component of the LAFW that removes microbes, endospores, and viruses from the air as it flows through. However, it is the flow of air between the HEPA filter and the sterile workspace that defines the critical area where the desired sterile environment is maintained.
By keeping this critical area clean and free from contamination, the LAFW ensures a controlled environment for working with biological materials.