How does transduction differ from transfection in terms of the method used to introduce DNA into cells?

• A. Transduction and transfection both use viruses to introduce DNA.
• B. Transduction uses physical methods, while transfection uses chemical methods.
• C. Transduction uses chemical methods, while transfection uses viruses.
• D. Transduction uses viruses to introduce DNA, while transfection uses chemical, electrical, or physical methods.

Answer: (D)