Which of these are characteristics of microorganisms?

• A. Microorganisms are so small they cannot be seen with the naked eye.
• B. Microorganisms can be multicellular or unicellular.
• C. Microorganisms include the smallest units of life and non-living infectious agents.
• D. Microorganisms can have DNA or RNA as their genetic material.
• E. A and B are correct.
• F. C and D are correct.
• G. All of the above are characteristics of microorganisms.