Step 1: Understanding the Concept:
Sanitization of closed containers requires effective methods.
The method must reach all surfaces.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the sanitization methods.
Step 3: Detailed Explanation:
Closed containers are effectively sanitized by circulation.
The sanitizing solution is circulated through the container.
Brush application is for open surfaces.
Fogging and spraying are for open areas.
Thus, circulation is the correct method.
Step 4: Final Answer:
Closed containers may be effectively sanitized by circulation.
Hence, the correct option is (A).