A researcher is preparing a protein sample for sequencing. Which steps should they take to ensure the protein is ready for sequencing?

• A. Perform cell lysis to extract proteins, followed by protein purification to isolate the protein of interest.
• B. Perform cell lysis and then immediately sequence the protein.
• C. Directly sequence the protein without any preparation.
• D. Use only protein purification without cell lysis.

Answer: (A)